Liverpool, 1976: Martha is lost. She's been lost since she was a baby, abandoned in a suitcase on the train from Paris. Ever since, she's waited in lost property for someone to claim her. It's been sixteen years, but she's still hopeful. Meanwhile, there are lost property mysteries to solve: a suitcase that may have belonged to the Beatles, a stuffed monkey that keeps appearing. But there is one mystery Martha has never been able to solve - and now time is running out. If Martha can't discover who she really is, she will lose everything...