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