The Heart-pounding New Thriller From The Sunday Times Bestselling Author Of Need To Know A Strange Sensation Runs Through Me, A Feeling That I Don't Know This Person In Front Of Me, Even Though He Matters More To Me Than Anyone Ever Has, Than Anyone Ever Will. You Go Into Your Son's Bedroom. It's The Usual Mess. You Tidy Up Some Dirty Plates, Pick Up Some Clothes, Open The Wardrobe To Put Them Away. That's When You Find It. And You Realize A Horrifying Truth... Your Own Son Might Be Dangerous. Keep You Close Is The Chilling, Relentless New Thriller From The Bestselling Author Of Need To Know.