On a trip to London, England, Katie and Derek visit a local theatre to see a Shakespearean play. But the show is interrupted by the appearance of a ghost claiming to be the spirit of William Shakespeare himself! Katie investigates, with the help of a new British friend, and learns that everything isn't as it should be at the Little London Theatre. Can she prove that this ghost isn't real and keep him from ruining the theatre's Halloween production of ghost-related Shakespeare plays? Find out in the 15th Katie Carter Mystery Story - Katie and the Mystery of Shakespeare's Ghost!