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Caller Unknown

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What to expect

Brought to you by Penguin.

They Took Her Daughter. Now She’ll Break Every Rule to Get Her Back.

From the Sunday Times bestselling author of Famous Last Words and Wrong Place Wrong Time comes an unmissable new thriller
Simone's holiday to Texas was meant to be some much needed bonding time with her teenage daughter, Lucy.

On their first night in the desert, Simone wakes to find Lucy missing and a mobile phone in her place. The phone rings: Lucy has been taken and, in order to get her back, Simone must commit a crime.

As Simone prepares to follow the kidnapper's instructions, she feels certain that there is nothing she wouldn't do to save Lucy. But becoming a wanted woman is just the start...

'The best of the best' LISA JEWELL
'As moving as it is gripping' SOPHIE HANNAH
'Utterly original' SHARI LAPENA
'You’ll gasp, you’ll cry, you’ll never forget this story' HOLLY SEDDON

© Gillian McAllister 2026 (P) Penguin Audio 2026

Critics Review

An unputdownable adventure that was both heartwarming and thrilling! Everything I've come to expect from Gillian McAllister!
FREIDA MCFADDEN
Gillian McAllister has done it again! This is such a clever, tense and twisty book, I inhaled it in under a day. The pacing is perfection and the twist, when it comes, is deeply satisfying, but it is the characters that elevate Gillian's books into the best of the best,
LISA JEWELL
Tense, twisty, and an emotional gut punch—CALLER UNKNOWN is a one-sitting read.
KARIN SLAUGHTER
A taut, heart-in-mouth action thriller. With Gillian McAllister’s trademark beautiful writing, not only is Caller Unknown a wonderfully atmospheric and twisty read, it’s also a powerful ode to motherhood. I couldn’t put it down. Absolutely superb
CLAIRE DOUGLAS
Chilling, immersive, atmospheric and poignant; Caller Unknown is beautifully told, with a wonderful trademark McAllister twist that fans will hope for but still not see coming. Masterful.
ANDREA MARA
An utterly original kidnap story that throbs with tension—hard to put down.
Shari Lapena
Another terrifically tense thriller from a writer at the absolute top of her game
ERIN KELLY
Utterly HOOKED! I was journeying through that desert, living every twist, turn and surprise. Immersive, heart-pounding and astoundingly brilliant.
LUCY CLARKE
Utterly compelling, gripping and so entertaining!
LIZ NUGENT
As moving as it is gripping, this superior thriller is, more than anything, a testament to the power of a mother’s love
Sophie Hannah

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