All Westwijk, a Dutch coastal holiday resort island, is excited about the arrival of cheerful celebrity singer Bo Monti and his haughty manager Franck Fellani. Recently moved-in Jack Appelboom, his sister Tessa and their local friend Chris Loman find a stray German shepherd dog and want to adopt him as fourth gang member. Mayor's daughter Chris braves her posh, airhead mother to keep the dog after it's discovered in the storage shed.