Human Remains: From the award-winning and Sunday Times bestselling author of IN THE BLINK OF AN EYE

Pre-order BODY OF LIES, the brand-new thriller in the Kat and Lock series, coming Spring 2026.
THE TRUTH WILL ALWAYS COME OUT – BUT AT WHAT COST?
Fresh from successfully closing their first live case, the Future Policing Unit are called in to investigate when a headless, handless body is found on a Warwickshire farm. But as they work to identify the victim and their killer, the discovery of a second body begins to spark fears that The Aston Strangler is back. 
When DCS Kat Frank is accused of putting the wrong man behind bars all those years ago, AIDE Lock – the world’s first AI detective – pursues the truth with relentless logic. But Kat is determined to keep the past buried, and when she becomes the target of a shadowy figure looking for revenge, Lock is torn between his evidence-based algorithms and the judgement of his partner, with explosive results.
When everything hangs in the balance, it will all come down to just how much an AI can learn, and what happens when they do…
PRAISE FOR JO CALLAGHAN:
‘This series just gets better and better in every way. The juxtaposition of a compelling story and characters with complex ethical questions is brilliantly done. A must read’ JENNIE GODFREY
‘A crime writer of exceptional quality’ STEVE CAVANAGH
‘A new force to be reckoned with in crime’ DAILY MAIL
‘An outstanding talent’ JANE CASEY
‘Callaghan writes with such intelligence; interspersing humour with moments of utter heartbreak’ NIKKI SMITH
‘An amazing writer’ FRANCES QUINN

From the Publisher

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Customer Reviews

4.4 out of 5 stars 5,775

4.5 out of 5 stars 1,465

4.5 out of 5 stars 628

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Book number
1 2 3 4

Read as series or standalone

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Crime procedural

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Case
Missing person Serial killer Serial killer Serial killer

Come for the…
World’s first AI detective Logic vs instinct detective pairing Twist that will change everything Final shocking truth

Publisher ‏ : ‎ Simon & Schuster UK
Publication date ‏ : ‎ 15 Jan. 2026
Language ‏ : ‎ English
Print length ‏ : ‎ 384 pages
ISBN-10 ‏ : ‎ 1398535559
ISBN-13 ‏ : ‎ 978-1398535558
Item weight ‏ : ‎ 270 g
Dimensions ‏ : ‎ 13 x 2.28 x 19.8 cm
Book 3 of 3 ‏ : ‎ Kat and Lock
Best Sellers Rank: 1,796 in Books (See Top 100 in Books) 15 in Techno Thrillers 49 in Science Fiction Crime & Mystery 157 in Women Sleuths (Books)
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