The compulsive thriller from the Sunday Times bestselling author of Everything but the Truth and Anything You Do Say. You'd trust your sister with your life. But should you?'An exceptional thriller with a thumping, emotional heart' Heat'Addictive, clever, twisty. McAllister's best book yet' SunThe police say she's guilty.She insists she's innocent.She's your sister.You love her.You trust her.But they say she killed the person you care about most.