What if you could remember just one thing? Maud is forgetful. She makes a cup of tea and doesn't remember to drink it. She goes to the shops and forgets why she went. Back home she finds the place horribly unrecognizable - just like she sometimes thinks her daughter Helen is a total stranger. But there's one thing Maud is sure of: her friend Elizabeth is missing. The note in her pocket tells her so. And no matter who tells her to stop going on about it, to leave it alone, to shut up, Maud will get to the bottom of it. Because somewhere in Maud's damaged mind lies the answer to an unsolved seventy-year-old mystery. One everyone has forgotten about. Everyone, except Maud...