Aspiring writer Aggie Morton is eager to spend the holidays at Owl Park, an enormous manor house in the country. Owl Park holds many delights, including a troupe of travelling actors, glamorous visitors from Ceylon, a secret passage and an emerald with a curse! Aggie refuses to believe there's anything to the superstition, until she and her friends discover a body instead of presents on Christmas morning. Aggie and Hector must once again put their deductive skills and imaginations to work and find a murderer on the loose . . .