Enthralling and addictive with relationships so real I can't believe they're not still continuing somewhere . . . Utterly brilliant -- Lisa Jewell A truly compelling story that captures exactly the complexity of friendship and motherhood and how everything we think we know can be challenged in one heartbreaking instant . . . Wonderful -- Jenny Quintana, author of The Missing Girl Guaranteed to send chills down every mothers spine, cutting to the heart of what it means to be a parent. Its also an incredibly clever, nuanced analysis of female friendship and its limits . . . Beautiful, highly atmospheric prose and superb plotting -- Kate Rhodes, author of Hell Bay and Burnt Island Emotionally compelling, I Thought I Knew You gets under the skin of the conflict between family and friendship, loyalty and suspicion when a terrible crime is committed. The portrayal of a lost teenage boy is heart-wrenching, while both sides of the story are painted with equal plausibility, leaving only instinct and unflinching maternal love -- Debbie Howells, author of The Bones of You and Her Sister's Lie The best books force you to question yourself. Penny Hancock's thought-provoking, morally complex novel, I Thought I Knew You, explores friendship and motherhood put to the ultimate test. Long after it ends, you'll still be tying yourself in knots asking, 'Well, what would I do?' -- Tammy Cohen, author of When She Was Bad and They All Fall Down A wonderfully nuanced, captivating page-turner -- Paula Daly, author of Just What Kind of Mother Are You? and Open Your Eyes A fabulous premise, expertly delivered . . . constantly leaving you on edge and fearful for characters you care about -- Craig Robertson, author of Random and The Photographer