So Sinister (Faith Bold #31)

So Sinister (Faith Bold #31) by Blake Pierce out on May 30, 2026.

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So Sinister (Faith Bold #31)

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So Sinister (Faith Bold #31) Release Date: May 30, 2026

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Bodies of TSA supervisors and security contractors appear with unexploded devices beside them as FBI Agent Faith Bold investigates what connects these leaders of K9 detection units. With Turk at her side, can Faith unravel whether these failed explosives are mistakes or deliberate symbols before another security expert becomes a victim?

“A masterpiece of thriller and mystery.”
—Books and Movie Reviews, Roberto Mattos (re Once Gone)
⭐⭐⭐⭐⭐

SO SINISTER is Book #31 in a long-anticipated new series by #1 bestseller and USA Today bestselling author Blake Pierce, whose bestseller Once Gone (a free download) has received over 7,000 five star ratings and reviews.

FBI Special Agent Faith Bold doesn’t believe she can ever return to the force after the trauma she’s been through. Suffering from past demons, she feels unfit for duty and content to retire—until Turk walks into her life.

Turk, a former Marine Corps dog, wounded in battle, suffers from his own demons. But he never lets it show as he gives everything to Faith to get her back on her feet.

Each is slow to warm up to each other, but when they do, they are inseparable. Each is equally determined to hunt down the demons chasing them, whatever the cost, and to watch each other’s backs—even at the risk of their own life.

A page-turning and harrowing crime thriller featuring a brilliant and tortured FBI agent, the Faith Bold series is a riveting mystery, packed with non-stop action, suspense, twists and turns, revelations, and driven by a breakneck pace that will keep you flipping pages late into the night. Fans of Rachel Caine, Teresa Driscoll and Robert Dugoni are sure to fall in love.

Future books in the series are also available!

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Genre: Thriller

Blake Pierce

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