Story is set in the 1930's; sounds a lot like an American mobster movie, with American slang. Johnny Black is starting a private eye business. He loves flying, but lost his licence because of an accident. Johnny is hired by the sister of a dead rich woman she's sure was killed by the husband (died like Isadora Duncan - in a sports car, strangled in a scarf). Big finale, Johnny kidnapped; can he fly a seaplane to escape ?