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.

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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 Estate series—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.

Giveaway

Lethal Design Celebration Tour Giveaway