A burglary gone wrong, a mistaken identity ...or something far worse? Tasha has always felt in the shadow of her older sister, Alice. Alice is married to wealthy entrepreneur Kyle and has a high-flying career, Tasha is married to her childhood sweetheart and lives in a Bristol suburb with their three-year-old twins. When Alice realises that Tasha is struggling she suggests she come to look after the twins for a week, so Tasha and her husband can enjoy a week away. But a few days in, it all goes terribly wrong. Tasha receives a phone call to say Alice is in hospital and Kyle is dead after an intruder broke into their house. A burglary gone wrong, surely. Until a note arrives saying 'It was supposed to be you...'