The phantom surfer

Jean and Louise Dana are spending spring vacation with their Starhurst School friends at the resort town of Horizon on the Atlantic coast. The seaside town is being restored to its original Victorian-era character -- but the restoration project is plagued by thievery and sabotage. The Dana sisters and their dates, Chris Barton and Ken Scott, are plunged into the mystery when they witness a lumber theft, discover that signals are being sent from an abandoned lighthouse, and see the nocturnal surfer who time after time mysteriously vanishes before reaching shore.