Follow a woman on a mission to find her kidnapped sister in this explosive new thriller from the Sunday Times bestselling author of Never Never! When Iris was a teen, her twin sister Piper was kidnapped.Now an adult, Iris wants one thing - proof. And if the police still won't help, she'll just have to find it her own way: by interning at the isolated Shoal Island Hospital for the criminally insane, where secrets lurk in the shadows and are kept under lock and key.But Iris soon realizes that something even more sinister is simmering beneath the surface of the Shoal, and that the patients aren't the only ones being observed…Praise for Tarryn Fisher:‘Will leave the most sure-footed reader uneasy until the last word is read' Sunday Times bestselling author Colleen Hoover‘A compulsive, brilliant, enthralling thriller… a novel that totally captures absolute love and utter deception, total obsession and cruel betrayal. I was hooked to the very last page' Sunday Times No.1 bestselling author, Adele Parks‘Fans of B A Paris will love this addictive page-turner' Woman's Weekly‘This page-turning psychological thriller by Tarryn Fisher will leave you guessing right until the end' HELLO!‘A perfect page-turner…a must-read' Woman & Home‘Gripping' Bella‘Compelling page-turner from a great writing duo' My Weekly‘A glorious thriller - you'll be asking for more!' Chat‘A tortuous romance mystery that will keep you guessing' Sunday Post‘A fantastic thriller that asks the question: how well do we know the people we love? Filled with twists and turns you won't see coming' PopSugar‘Not just an original story but an equally original plot twist … an emotional and psychological crescendo that will keep readers on their toes until its final page' USA Today