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Book Summary and Reviews of Caller Unknown by Gillian McAllister

Caller Unknown by Gillian McAllister

Caller Unknown

A Novel

by Gillian McAllister

  • Critics' Consensus (8):
  • Readers' Rating (6):
  • Published:
  • May 2026, 352 pages
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About this book

Book Summary

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). 

Please be aware that this discussion guide will contain spoilers!
  1. How does the book explore the theme of familial sacrifice? Do you think Simone's actions were justified, given the circumstances?
  2. Who was your favorite character? Did you connect with one over the others? Which character's actions surprised you the most, and why?
  3. How does the setting of the novel inform the story and its themes?
  4. Which twist surprised you the most, and why?
  5. How does the alternating perspectives affect your experience of the story? How did hearing the kidnapper's perspective influence your understanding of the crime and its impact?
  6. Take a look at Lucy and Simon's relationship—how does it change and evolve through the novel? What does this book say about mother-daughter ...
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Reviews

Media Reviews

"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

"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

This information about Caller Unknown was first featured in "The BookBrowse Review" - BookBrowse's membership magazine, and in our weekly "Publishing This Week" newsletter. Publication information is for the USA, and (unless stated otherwise) represents the first print edition. The reviews are necessarily limited to those that were available to us ahead of publication. If you are the publisher or author and feel that they do not properly reflect the range of media opinion now available, send us a message with the mainstream reviews that you would like to see added.

Any "Author Information" displayed below reflects the author's biography at the time this particular book was published.

Reader Reviews

Write your own reviewwrite your own review

Bonnie Goldberg

Another winner from McAllister
Gillian McAllister is an auto-buy for me and seeing a new thriller always sparks joy. Caller Unknown offers the two characteristics I have come to think of as "McAllisterian" - one, a story that heads in directions you cannot possibly predict, and two, despite a pulse-pounding thrilling narrative, the focus is on relationships. In this case, the relationship that McAllister is exploring is that of a mother daughter, when the daughter is on the cusp of leaving the nest. Using the metaphors of a mother about to "lose" her daughter, McAllister sets up a scenario when said mother is really about to lose her daughter unless she gives in to a kidnapper's demands. Highly recommend.

Janine_S

Fast-paced thriller
This is a fast paced, exciting thriller asking the question: what would you do to save your child? It’s a propulsive read and one that keeps you on the edge of your seat. As the title suggests, a series of calls from an unknown number set off events that test the moral fiber of the characters.

Simone Seaborn and her daughter, Lucy, are on a camping trip in Texas having a long awaited vacation. They settle down for the night at a motel where Simone receives a call from an unknown number saying Lucy, has been kidnapped. Instead of a ransom, she must now commit crimes herself if she wants to get Lucy back, and in doing these she must navigate small Texas towns and remote desert areas. For Simone motherhood is her pride and joy after having had a traumatic childhood, so she sees no other choice.

The tension is at time unbearable. As each task is given you wonder will it ever end. You feel intensely for Simone and it’s heart wrenching at times. This is a perfect read for lovers of psychological thrillers with an edge of tenuous morality in the telling.

I’d like to thank NetGalley and William Morris for allowing me to read this ARC.

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Author Information

Gillian McAllister

Gillian McAllister is the New York Times bestselling author of Reese's Book Club Pick Wrong Place Wrong Time, Famous Last Words, Just Another Missing Person, Everything but the Truth, The Choice, The Good Sister, The Evidence Against You, How to Disappear, and the Richard & Judy Book Club pick That Night. She graduated with an English degree before working as a lawyer. She lives in Birmingham, England, where she now writes full-time. She is also the creator and co-host of the popular Honest Authors podcast. 

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