After a hang glider crashes into the pool of the house where Dinah and Madge are house-sitting, the hapless pilot creates more than a splash of suspicion in Dinah's mind. Why does this itchy intruder make off with Dinah's inflatable turtle? Why is someone trying to drive their cat-mad neighbor away? And what is the connection with the balding stranger seen lurking behind the hedge? And when Madge's boyfriend starts a campaign to save the endangered spotted owl, it seems that a crooked politician may be out to destroy the habitat of the near-extinct animal. While Madge paints, Dinah brushes aside suggestions that she be a quiet, well-behaved guest in this posh North Vancouver neighborhood. There's just too much for Dinah and her friends—tree-fanatic Pantelli and irritatingly conscientious Talbot—to investigate in this hilariously suspenseful adventure. Along with learning about endangered animals and fragile ecosystems, Dinah runs across clueless reporters and greedy developers, all the while continuing to belt out her favorite songs and satisfy her healthy appetite.
Joe and his friend Skip are enjoying the thrill of the Big Dip, a famous rollercoaster, until they learn the old man in front of them has been shot. The old man mutters with his dying breath something about getting a Margaret Rose to the police. Joe leaves the crime scene to get on with his life. But someone is desperate for the Margaret Rose and thinks Joe has it. When his sister is kidnapped, Joe is in a race against time to solve the puzzle.