Horses run hot and murder runs cold, but Jockey Club investigator David Cleveland always keeps his cool.

London attorney Steven Vey has a brilliant career, a beautiful wife, and money to burn. To top it off, he's about to be named Britain's youngest-ever judge. But one night a celebration with his pretty secretary, Nicky, goes too far. He calls it a drunken indiscretion; she calls it rape. Meanwhile, Birmingham punk Eddy Doyle is fresh out of prison with no prospects. After learning that the stuffy vicar who raised him isn't his real dad, Eddie goes...

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?