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Someone Must Know

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What to expect

Every ninety seconds someone is reported missing in the UK. Most return, but some do not. This book is about those who stay missing.

The police are unable to investigate every case fully. But the missing always leave behind traces – clues as to who they might have been and where they might have gone.

Dave Grimstead, a retired detective inspector, has built Locate International: a remarkable team of volunteers – oceanographers and genealogists, forensic linguists and vintage clothes experts, students and retirees – all united by a desire to follow the clues wherever they lead.

Someone Must Know brings readers into the heart of stories that cross decades and international borders in the search for the truth. In a world where the questions begin with a scrap of wet paper in a pocket, an old dress or a faded photograph, the answers are by turns devastating, poignant and deeply mysterious.

Through riveting cold cases, from the tall man washed up at sea with weights tied to his ankles, to the mother who left home one morning and slipped through the cracks of everyday life, Someone Must Know is a study in how to reconstruct whole lives from fragments of evidence, for people who are gone but do not deserve to be forgotten.

'Heart-rending but utterly uplifting' PROFESSOR LADY SUE BLACK, author of All That Remains

'Gripping and compassionate' VAL MCDERMID

‘Fascinating’ LYNDA LA PLANTE CBE

'Enthralling ... carried me along in a tidal wave of page-turning intrigue' DUNCAN HARDING

'By the end of this book you'll want to join Locate's team yourself' ANGELA GALLOP

© Dave Grimstead 2026 (P) Penguin Audio 2026

Critics Review

Reads to the heart and soul of what it means to be human - caring for people who are missing or unidentified and bringing them home. Heart-rending in places but utterly uplifting throughout
PROFESSOR LADY SUE BLACK, author of All That Remains
Gripping and compassionate, it digs beneath the surface to expose the agony of those lost and those left behind
VAL MCDERMID
Captivating and enthralling, this book carried me along in a tidal wave of page-turning intrigue. An absolutely fascinating read that I was lost in from start to finish. A brilliant book and a new voice to watch
DR DUNCAN HARDING, author of The Criminal Mind
‘The investigative work Dave Grimstead, his colleagues and the volunteers carry out is quite remarkable. This book is a thoroughly fascinating and informative read’
LYNDA LA PLANTE CBE
A unique and important book of stories told with the pace of a detective novel, brimming with the mystery and intrigue of a true crime series, and shot through with real heart and hope. Dave Grimstead's vision that no missing or unidentified person should be forgotten or lose their identity, and the story of the organisation he built to ensure this, will restore your faith in people and heartily entertain you into the bargain
EVIE KING, author of Ashes to Admin
A fascinating glimpse into a mysterious world. Thanks to Dave's dynamic storytelling the reader is constantly kept on their toes . . . I was struck by the eloquence of his insight. This passion is infectious and by the end of the book you'll want to join the team yourself
Dr Angela Gallop, author of When the Dogs Don't Bark
Author Dave Grimstead
Narrator Dave Grimstead
Duration 7 hours and 42 minutes
Release Date
ISBN 9781529970609
Format Audiobook
Publisher Random House
Genre Charities, voluntary services and philanthropy, Criminal investigation and detection, True crime, Victimology and victims of crime
Availability AU, GB, IE

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