The twisty new psychological thriller from the Sunday Times bestselling author A race against time to save her child. In seven days, Maggie's son, Seb, turns three. But she's not planning a party or buying presents or updating his baby book. She's dreading it. Because in her world, third birthdays are the days on which the unthinkable happens. she loses her child. For the last twelve years Maggie has been imprisoned in a basement. Abducted aged fifteen, she gave birth to two sons before Seb, and on their third birthdays her captor came and took them from her. She cannot let it happen again. But she has no idea how to stop it. And the clock is ticking.