Jim is sent to France to help solve the murder of an unidentified Jersey resident. He turns out to have been Jack Moberley, a private eye, who was trailing eccentric lawyer Lionel Carteret on behalf of his family. Lionel has plans to marry a countess, whose house has been repossessed by the local casino, due to her late husband's gambling debts. When a gun is found in her bedroom it would seem that she killed Moberley, but there are other suspects, including Lionel and his family and the casino owner.
—don @ minifie-1