"An unputdownable adventure that was both heartwarming and thrilling! Everything I've come to expect from Gillian McAllister!" —Freida McFadden, #1 New York Times Bestselling Author  “Only a Gillian McAllister thriller can make your heart race and then your heart melt from one page to the next! I’m a devoted fan!” —Liane Moriarty, #1  New York Times  bestselling author How far would you go to rescue your child? A mother races against the clock—and finds herself on the wrong side of the law—in a desperate fight to save her teenage daughter in this pulse-pounding thriller from the author of Reese’s Book Club Pick and  New York Times  bestseller  Wrong Place Wrong Time . There is nothing that Simone won’t do for her daughter, Lucy. The two have always been close, and with Lucy about to leave home for university, they depart the UK for a vacation to Texas to spend some quality time together. But when Simone awakens on their first morning in the desert, Lucy is gone, missing from their rental cabin. In her place is a cell phone, and a voice on the other line issues a shocking ransom demand. Don’t tell the police. Come to this location. And be prepared to do a deal… Though Simone’s husband urges her to bring in the authorities for help, she knows she can’t take any chances. The kidnappers might kill Lucy if she tells anyone. No mother would take that risk. Instead, that night, she drives to the isolated meet-up. What she finds there changes everything. The mysterious kidnapper doesn’t want money. They want Simone to do something. The unthinkable. A catastrophic chain of events is set in motion, with chilling consequences that extend beyond Simone and her family. What follows is a heart-pounding journey through the small towns and punishing deserts of remote Texas, in which Simone’s courage—and morality—is pushed to the brink as she discovers what it truly means to be a mother. Unbearably tense, compassionately told, and full of well-crafted moral dilemmas, Caller Unknown proves once again why Gillian McAllister’s thrillers are “the best of the best” (Lisa Jewell).  "An unputdownable adventure that was both heartwarming and thrilling! Everything I've come to expect from Gillian McAllister!" - Freida McFadden, #1 New York Times Bestselling Author “Tense, twisty, and an emotional gut punch— Caller Unknown is a one-sitting read.” - #1 New York Times Bestselling Author Karin Slaughter “An utterly original kidnap story that throbs with tension—hard to put down." - Shari Lapena, #1 Internationally Bestselling Author of She Didn’t See It Coming “Reader favorite McAllister is back with a pulse-pounding thriller….This is a knockout.” - Booklist (starred review) "Beneath the breathless pacing, McAllister offers a thoughtful meditation on the evolving bond between mother and daughter: what it means to let go and what it costs to hold on too tightly." - Library Journal "Beneath the breathless pacing, McAllister offers a thoughtful meditation on the evolving bond between mother and daughter: what it means to let go and what it costs to hold on too tightly." - Library Journal “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, and the family dynamics that are so richly described that it's hard to believe they don't continue long after the book ends.” - Lisa Jewell, #1 New York Times bestselling author “Only a Gillian McAllister thriller can make your heart race and then your heart melt from one page to the next! I’m a devoted fan!” - Liane Moriarty, #1 New York Times bestselling author "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, internationally bestselling author "The pacing in this is magnificent, relentlessly pushing this reader forward. I read it in two days. Utterly compelling, grippy mcgripping and so entertaining!" - Liz Nugent, internationally bestselling author of Strange Sally Diamond "Utterly HOOKED! I was journeying through that desert, living every twist, turn and surprise. Immersive, heart-pounding and astoundingly brilliant." - Lucy Clarke, Sunday Times bestselling author of One of the Girls “Gillian McAllister [is] one of my favorite authors working in the genre. McAllister is the best at putting her characters in impossible situations and making her readers not only contemplate but feel what it would be like to find themselves in those situations.” - Emily Henry, #1 New York Times bestselling author, on Just Another Missing Person "Only a Gillian McAllister thriller can make your heart race and then your heart melt from one page to the next! I’m a devoted fan!" - Liane Moriarty, #1 New York Times bestselling author, on Famous Last Words “As a fiction writer myself it’s really, reall