Every Thursday at midday, Audrey Brooks cleans the Petrov house. Mr. Petrov is never home, but that doesn't affect the care with which she mops, polishes and carefully winds each of the dozens of beautiful clocks that decorate the tall, elegant, empty London mansion. Until the morning she finds a corpse in the back bedroom and flees the house in panic. Fifteen minutes later, the police arrive…and find nothing. With no victim, the police are convinced there was no murder, but Audrey knows better. A man has been killed, and if they won't do anything about it, she --- and her annoying friend, Lewis --- will. Whodunit is one thing, but this detective duo also must wrestle with when --- and where on earth is the body? 

When a minor criminal is murdered in the smallest residential square in London, elderly heiress and landlady Celeste van Duren recruits two of her tenants to investigate. Her cleaner, Audrey, knows everyone and is liked by all, while failed writer Lewis is known by no one. He hates his job and his life, and he’s not that fond of Audrey either --- but Celeste is persuasive. As they hunt for clues in and around the Square, they discover everyone has something to hide, including their fellow residents. Audrey and Lewis must find a way to work together if they’re to find the killer in their midst. Assuming, of course, there’s just the one.