Second Nature (A Sierra Knight FBI Suspense Thriller—Book Seven‪)‬

"“This is an excellent book… When you start reading, be sure you don’t have to wake up early!”
—Reader review for The Killing Game

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Rookie FBI Agent Sierra Knight follows her murdered mother’s footsteps in joining the FBI, determined to solve her cold case. Armed with a box of unsolved murder files, Sierra must hunt an elusive killer across years of history. But stirring up the past may just leave her to be targeted herself…

Hospital workers are being murdered with the very tools meant to heal, but Sierra Knight believes the mentally ill patient who confesses might be covering for the true killer. Using her mother's meticulous case notes to expand beyond the hospital's walls, Sierra must prove that justice failed, while a murderer remains free to kill again.

SECOND NATURE is the seventh book in a long-anticipated new series by #1 bestselling mystery and suspense author Kate Bold, whose bestseller NOT ME (a free download) has received over 3,000 five star ratings and reviews. The series begins with SECOND GIRL (book #1).

The Sierra Knight mystery series delivers heart-pounding tension through intricate plots packed with stunning revelations. With her razor-sharp instincts and relentless pursuit of justice, Sierra navigates twisted criminal minds while keeping readers on edge until the final page. Fans of Lisa Gardner, Karin Slaughter, and Patricia Cornwell are sure to fall in love.

Future books in the series are also available!


“This book moved very fast and every page was exciting. Plenty of dialogue, you absolutely love the characters, and you were rooting for the good guy throughout the whole story… I look forward to reading the next in the series.”

—Reader review for The Killing Game

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“Kate did an amazing job on this book and I was hooked from the first chapter!”

—Reader review for The Killing Game

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“I really enjoyed this book. The characters were authentic, and I see the bad guys as something we hear about daily on the news... Looking forward to book 2.”

—Reader review for The Killing Game

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“This was a really good book. The main characters were real, flawed and human. The story went along quickly and wasn't mired in too many unnecessary details. I really enjoyed it.”

—Reader review for The Killing Game

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“Alexa Chase is headstrong, impatient, but most of all brave with a capital B. She never, repeat never, backs down until the bad guys are put where they belong. Clearly five stars!”

—Reader review for The Killing Game

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“Captivating and riveting serial murder with a twist of the macabre… Very well done.”

—Reader review for The Killing Game

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“WOW what a great read! Talk about a diabolical killer! Really enjoyed this book. Looking forward to reading others by this author as well.”

—Reader review for The Killing Game

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“Page turner for sure. Great characters and relationships. I got into the middle of this story and couldn’t put it down. Looking forward to more from Kate Bold.”

—Reader review for The Killing Game

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“Hard to put down. It has an excellent plot and has the right amount of suspense. I really enjoyed this book.”

—Reader review for The Killing Game

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“Extremely well written, and well worth buying and reading. I can't wait to read book two!”

—Reader review for The Killing Game

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