The Other Half Lives By Sophie Hannah

Ruth Bussey knows what it means to be in the wrong and to be wronged. She once did something she regrets, and her punishment nearly destroyed her. Now Ruth is rebuilding her life, and has found a love she doesn’t believe she deserves. Aidan Seed. Aidan is also troubled by a past he hates to talk about, until one day he decides he must confide in Ruth. He tells her that years ago he killed someone: a woman called Mary Trelease.

Ruth is confused. She’s certain she’s heard the name before, and when she realises why it sounds familiar, her fear and confusion deepen – because the Mary Trelease that Ruth knows is very much alive…