The very proper butler, Jenkins, and the fiery Cockney maid, Sarah Jane, are preparing the Covington household for a visit from Edwina Corry, the world’s greatest mystery author and friend to Lady Miranda and Colonel Covington. Other guests arriving include Lady Covington’s feisty old mother, their high-flying daughter Kat, their chatty priest, and the caddish, neighbor boy Trevor. Things are soon thrown into confusion, however, when someone is found stabbed to death in the kitchen. On her arrival, Edwina eagerly launches an investigation into the murder. The evidence is stacked against Jenkins. And now he’s got just half an hour to figure out who the murderer is.