Leave No Trace: A Novel
Jan 2025 · Sold by Random House
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About this ebook
From the bestselling author of In the Blink of an Eye comes an inventive thriller that pits algorithms against experience, logic against instinct, and one undetectable killer against two extraordinary detectives.
“Unswervingly gripping and scary, and at the same time beautifully tender and humane.”—Nicci French, author of Has Anyone Seen Charlotte Salter?
When the body of a man is found crucified at the top of a hill in the British Midlands, AIDE Lock—the world’s first AI detective—and Detective Kat Frank are thrust into the spotlight as they are given their first live case. When a second body is found, the police issue an extraordinary warning to local males aged between thirty and forty years old:
• Avoid drinking in pubs.
• If you insist on going to a pub, do not leave alone.
• And definitely do not leave a pub with a stranger.
With the national media and local men in an uproar, Kat and Lock have to combine their instincts and algorithms to catch the killer before they can strike again.
“Unswervingly gripping and scary, and at the same time beautifully tender and humane.”—Nicci French, author of Has Anyone Seen Charlotte Salter?
When the body of a man is found crucified at the top of a hill in the British Midlands, AIDE Lock—the world’s first AI detective—and Detective Kat Frank are thrust into the spotlight as they are given their first live case. When a second body is found, the police issue an extraordinary warning to local males aged between thirty and forty years old:
• Avoid drinking in pubs.
• If you insist on going to a pub, do not leave alone.
• And definitely do not leave a pub with a stranger.
With the national media and local men in an uproar, Kat and Lock have to combine their instincts and algorithms to catch the killer before they can strike again.
From the bestselling author of In the Blink of an Eye comes an inventive thriller that pits algorithms against experience, logic against instinct, and one undetectable killer against two extraordinary detectives.
“Unswervingly gripping and scary, and at the same time beautifully tender and huma...
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Ratings and reviews
1 review
Virginia “Ginger” Sheppard
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January 15, 2026
well developed characters. tackles gender bias. AI can help make things faster and easer but not replace human intuition.
About the author
Jo Callaghan works full-time as a senior strategist, carrying out research into the future impact of AI and genomics on the workforce. After losing her husband to cancer in 2019, when she was just forty-nine, she started writing In the Blink of an Eye, her debut crime novel, which explores learning to live with loss and what it means to be human. She lives with her two children in the British Midlands.
Jo Callaghan works full-time as a senior strategist, carrying out research into the future impact of AI and genomics on the workforce. After losing her husband to cancer in 2019, when she was just forty-nine, she started writing In the Blink of an Eye, her debut crime novel, which explores learni...
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