Off to a resort with summer jobs, the gang stumbles onto a mystery when the Frog Monster of Lake Erie makes an unexpected appearance, scaring away all the guests. Only Mystery Inc. can save the day, but with a creature on the loose, mystical moonstones and summer romance in the air, will they be able to work as a team and solve the crime?

Ichabod Crane is resurrected and travels through two and half centuries of time to solve a mystery that dates back to the eighteenth century.

Detective Constable Endeavour Morse becomes drawn into a murder investigation that changes the course of his life.