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Lethal Design by S. F. Baumgartner Review and Giveaway

August 3, 2026 Babbling Becky L

About the Book

Book: Lethal Design (KC & Orlando Prime Book 2)

Author: S.F. Baumgartner

Genre: Crime Thriller with Christian elements

Release Date: August 4, 2026

Some deaths are designed.

The death looks routine — no foul play, no reason to dig. But KC knows this building and what happened here a year ago. And the pattern spreading across the city is no coincidence.

Professionals with no addiction history are dying along eerily similar paths. Someone patient and invisible is engineering these outcomes. As the Orlando Prime task force chases separate leads across the city, the threads begin pointing to the same dark center.

The closer they get, the more dangerous the truth becomes. Some designs were never meant to be uncovered — and the cost of exposing this one may be more than any of them are prepared to pay.

Perfect for fans of Terri Blackstock and Lynette Eason who love fast-paced, clean crime thrillers with the intensity of Criminal Minds and the grit of NCIS.

Follow Kylie “KC” Cassidy and the Orlando Prime task force as they take on the cases no one else can crack, starting with Lethal Design.

Click here to get your copy!

About the Author

S.F. Baumgartner crafts fast-paced Christian suspense thrillers, weaving tales of complex characters, secretive operatives, and relentless agents. Her gripping storytelling has earned acclaim, with Living Secrets and Forgotten Secret—Books 1 & 2 of her Mirror Estate series—named Top Picks in the thriller & suspense categories, respectively, at Killer Nashville, and Tangled Secrets—Book 3 of Mirror Estateseries—won couple of awards in the Christian Indie Awards and the Incipere Awards. When she’s not plotting her next twist, she’s binge-watching crime TV shows, like NCIS or playing with her cats. Fans of James Patterson’s style, especially those who appreciate short, punchy chapters, will find much to love in her work.

More from S.F.

Lethal Design, Book 2 in the KC & Orlando Prime series, shifts the spotlight in a powerful way. While Fatal Invitation centered on Detective Kylie Cassidy, this installment dives deep into the elite Prime Task Force, especially its leader, Commander Frank Travers.

A year ago, Travers lost his wife to a brutal, unsolved murder. The case went cold. The killer vanished. But in Lethal Design, that past refuses to stay buried.

As KC and the Prime team investigate a new wave of suspicious deaths, threads begin to surface, threads that may finally lead Travers to the truth he’s been chasing. And this time, it’s personal.

What makes this story especially layered is how it connects back to the larger conspiracy introduced in Stolen Secrets. Pieces are moving. Secrets are colliding. And everything must align as the story builds toward a confrontation that’s been a long time coming.

Expect high-stakes action, tight investigative work, and emotional tension as justice and revenge blur into something far more dangerous.

Because when Travers comes face-to-face with his wife’s killer… there’s no guarantee he walks away.

And KC may be the only one who can keep him from crossing a line he can’t come back from.

My Impressions

“On the floor beside her body, smeared and uneven, traced in her own blood with a finger that must have been failing, were the words ‘no suicide confutatis m.’”

I hope you read prologues! If you skip the prologue for S. F. Baumgartner’s Lethal Design (K.C. & Orlando Prime Series #2), you’ll miss vital info in this clean, exciting, thriller novel. I definitely recommend reading the first book of the series, and possibly The Mirror Estate Series first for background.

Baumgartner creates great tension with her Orlando Prime team, a special crime team, led by Frank Travers, a retired navy commander. Frank’s team is tasked with investigating seven different cases of apparent opioid suicide across cental FL in little over a year. The odd element is, none of the deceased had previous drug histories. While Frank’s team is investigating these, he has quietly asked Detective Kylie (K. C.) Cassidy and her partner on the Orlando Major Crimes police force, Rick Spaulding, to investigate his wife’s murder a year previous.

So interesting to see the workings of the different police, FBI, and other forces as they slowly converge, overlapping each other, sometimes competing, sometimes cooperating with each other. Viewers of shows like NCIS and Criminal Minds will love the procedural detail.

I enjoyed getting to know Frank Travers and KC better in this story. We also get re-acquainted with the people on the Prime team. Jack is especially interesting. Probably the youngest on the team, he is the forensic specialist on the team. Smarter than a whip, he can uncover anything asked of him, but can he ever birdwalk! So many eyerolls when team members are conversing with Jack!

The Architect. He is a main player on the adversary side in this drama, and we are privy to much of his convoluted thought life and plans. Can the reader figure out his identity before we are told? Like the Mirror Estate series, this is very much a psychological thriller! Baumgartner somehow pulls me into a world I don’t frequent or fully understand, but makes me fully invested and ready to lose sleep to discover the answers. Twists! This book has them in spades! I was a little disappointed to find that the end has a bit of a cliffhanger. But I should know by now!

Now, I wonder, what direction will this series go? And there will be another spin-off series as well, The Zoe Hunter Mysteries. Wow! Bring ‘em on!

I received a copy of the book from the author and publisher via Celebrate Lit and BookFunnel. I also bought my own copy. No positive review was required, and all opinions are my own.

Notable Quotables:

“Truth mattered far less than narrative.”

“Need-to-know had kept people alive for centuries. It also kept them ignorant.”

“…desperation makes people vulnerable,”

“Whoever staged this is good.” “Or arrogant.” “Those usually overlap.”

“His right hand went into his pocket to stroke the key chain he took from his target. A symbol of his win.” -The Architect

“Interesting how memory preserves sensory details.” [too true!]

Blog Stops

Book Reviews From an Avid Reader, July 31

The Lofty Pages, July 31

Debbie’s Dusty Deliberations, August 1

Vicky Sluiter, August 2 (Author Interview)

For Him and My Family, August 3

Babbling Becky L’s Book Impressions, August 4

Texas Book-aholic, August 5

Truth and Grace Homeschool Academy, August 6

For the Love of Literature, August 7 (Author Interview)

Blogging with Carol, August 8

Because I said so, August 9

Happily Managing a Household of Boys, August 10

Tell Tale Book Reviews, August 11 (Author Interview)

Mary Hake, August 12

Betti Mace, August 13

Leslie’s Library Escape, August 13

Giveaway

To celebrate her tour, S.F. is giving away the grand prize of a $50 Amazon Gift Card and an eBook copy of the book!!

Be sure to comment on the blog stops for extra entries into the giveaway! Click the link below to enter.

https://gleam.io/uhz7K/lethal-design-celebration-tour-giveaway

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Fatal Invitation by S. F. Baumgartner Review and Giveaway

January 19, 2026 Babbling Becky L

About the Book

Book: Fatal Invitation

Author: S.F. Baumgartner

Genre: Crime Thriller

Vanished women. A rising body count. A detective who won’t quit.

Detective Kylie “KC” Cassidy thought Major Crimes would be her big break. Instead, she’s chasing the brutal murders of young women—and the trail keeps circling back to Assistant State Attorney Gavin Watkins and his elusive ally, Kozlov.

Each lead vanishes before her eyes, every step forward dragging her deeper into danger. And when Kozlov’s men come after her, KC must rely on her instincts, and on the few people she can trust, to survive long enough to expose the truth.

But when KC gets too close to the truth, she becomes the target. Will KC survive the trap and bring down the predators or become their next victim?

If you like the relentless pursuit of justice in Michael Connelly’s Harry Bosch series, the sharp investigative instincts of Lisa Gardner’s D.D. Warren, then you’ll be captivated by Fatal Invitation, a gripping, fast-paced crime thriller.

Click here to get your copy!

About the Author

S.F. Baumgartnercrafts fast-paced Christian suspense thrillers, weaving tales of complex characters, secretive operatives, and relentless agents. Her gripping storytelling has earned acclaim, with Living Secrets and Forgotten Secret—Books 1 & 2 of her Mirror Estate series—named Top Picks in the thriller & suspense categories, respectively, at Killer Nashville, and Tangled Secrets—Book 3 of Mirror Estateseries—won couple of awards in the Christian Indie Awards and the Incipere Awards. When she’s not plotting her next twist, she’s binge-watching crime TV shows, like NCIS or playing with her cats. Fans of James Patterson’s style, especially those who appreciate short, punchy chapters, will find much to love in her work.

More from S.F.

A New Adventure Begins: Introducing the Detective Kylie Cassidy Series

I’m thrilled to announce that Fatal Invitation, the first full-length novel in the Detective Kylie Cassidy series, is here!

If you’re new to Detective Kylie “KC” Cassidy, I recommend starting with Christmas Murders to get acquainted with this compelling character. And here’s a treat: there’s a free story called Orlando Prime – Origins available under the Freebie tab on my website at sfbaumgartner.com. This story introduces you to the elite crime-fighting unit and the team members who work alongside KC. Both KC and Orlando Prime take center stage in Fatal Invitation.

Writing this book has been an absolute blast! Unlike my Mirror Estate series, the Detective Kylie Cassidy series features self-contained stories in each book—think of it like your favorite TV crime drama where each episode (or book) solves a complete case. While there may occasionally be an overarching storyline, you can jump in at any point and enjoy the mystery. And as always, my books are clean reads.

Since this is a spin-off of the Mirror Estate series, longtime readers will enjoy spotting familiar faces. A few beloved characters get mentioned, and some may even guest-star in future books!

I truly hope you’ll fall in love with this new series as much as I’ve loved creating it.

Happy Reading!

My Impressions

“KC felt the familiar chill that came with recognizing a pattern. A beautiful influencer. A too-good-to-be-true opportunity. A young woman who trusted the wrong person.”

Whew! I escaped alive out of that crime thriller! S.F. Baumgartner writes in such a compelling way, I thought I was present in the scenes of Fatal Invitation. This series is a spin-off of the Mirror Estates series. Each book in the series can be a standalone. Kylie “KC” Cassidy is a small town detective who has just moved up to the Orlando Police Department. Still, the very first murder victim she investigates is one from her small town where she used to live with her Aunt Mae.

When a second victim with a similar MO is found shortly after, KC and her partner fight to keep jurisdiction from turning over to Orlando Prime, the city’s elite crime fighting organization. One aspect of the book is following KC and her new partner, Spaulding, to see if they can learn to work together and trust each other. After so long working by herself, can KC adjust to not only having a partner, but sharing her case with a whole nother unit?

Another is getting an overview of the Orlando Prime team, headed by Commander Frank Travers and his gang that is almost like family. I enjoyed meeting all of these individuals, and getting a feel for their place in crime solving. Jack has to be the comic relief of the team, in a sense. He is so very intelligent, but can he ever bird-walk. I could feel the whole team groaning whenever it was time for him to report in!

KC and the Orlando Prime team first believe they are tracking a serial killer. But what they eventually uncover is something more planned, more pervasive, and more deeply rooted than they could have imagined. Do they have the skills and resources to expose something so sinister before it takes them, especially KC, out?

Be ready for lots of characters, fast action, nail-biting tension, and a few twists. I will be looking forward to reading the rest of this clean, crime fiction series!

I received a copy of the book from Celebrate Lit. I also bought my own ebook. No positive review was required, and all opinions are my own.

Notable Quotables:

“And men under pressure do two things.” Eli’s voice lowered. “They break, or they double down.”

“He’d thrown away his medical license, his marriage, his self-respect. But maybe, just maybe, he could throw away his fear too.”

“But some of the most dangerous predators operated in plain sight, hiding behind credentials and public trust.”