For young detective Aggie Morton and her friend Hector, Christmas becomes a lot more exciting when a dead body is found. Aspiring writer Aggie Morton is looking forward to Christmas. Having just solved a murder and survived her own brush with death in her small town of Torquay on the coast of England, Aggie can't wait to spend the holidays with her sister Marjorie, the new Lady Greyson of Owl Park, an enormous manor house in the country; Grannie Jane and her fellow sleuth and partner in crime, Hector Perot. Owl Park holds many delights including Aggie's almost cousin Lucy, exciting and glamorous visitors from Ceylon and disguises aplenty in the form of a group of traveling actors, not to mention a secret passageway AND an enormous, cursed emerald. Not even glowering old Lady Greyson (the Senior) can interfere with Aggie's festive cheer. But when Aggie and her friends discover a body instead of presents on Christmas morning, things take a deadly serious turn. With the help of a certain nosy reporter, Aggie and Hector will once again have to put their deductive skills and imaginations to work to find the murderer on the loose.