1x2 - Murder Call

Late night. A voice recites limericks on a moonlit beach. Suddenly, all goes quiet. A grey dawn, and a dog and its owner, the stern Major Richter, make a gruesome discovery - a human head attached to the very dead body of Adrian McCafferty who is buried up to his neck under the sand. Adrian drowned when the tide came in and covered him. Tessa and Steve learn that there was a beach party last night. Adrian was buried as part of a joke. Is his death simply a stupid party prank gone wrong, or is there something more sinister to discover?