Wealthy widow Mrs. Harlowe has died at her house in Dijon, apparently of natural causes. But then her brother-in-law accuses her niece Betty of poisoning the old woman; Jim Frobisher, junior partner in the office of Betty's English solicitors, is dispatched to France to provide legal advice and support. In France, as Jim seeks to discover the truth and clear Betty, he enters into an uneasy alliance with the enigmatic and mercurial Sûreté detective, Inspector Hanaud ...