Episode 1

When Beatrice hears that her younger sister, Tess, is missing, she leaves her job in New York and returns home to London on the first available flight. Having already lost her little brother, who died of Cystic Fibrosis as a child, Bee cannot bear the thought of losing her sister. When she tells the police that Tess had been getting nuisance calls, and that she was pregnant by a lecturer at her college who hadn't wanted her to have the baby, the police decide to do a reconstruction of Tess's last known movements.

This is Rosamund Lupton's first novel, a tense psychological thriller that explores the powerful bond between sisters that endures beyond death. The abridger is Lauris Morgan Griffiths and the reader is Hattie Morahan.

Producers: Sara Davies and Christine Hall.