The staff in high society households are expected to be unobtrusive, but a dead butler in the dining room tends to get noticed. Did he die of natural causes or was he poisoned?

Cleo is hired by the housekeeper at a Mayfair residence after the police rule the sudden death of the butler was the result of natural causes. Not convinced by the verdict, she wants Cleo to prove foul play was involved. Considering he was acting mysteriously around some of the guests, and they were equally mysterious when they saw him, murder is a possibility.