Post-Mortem Evidence — S. Fowler Wright

When Mrs. Hamilton dies, Inspector Combridge receives an anonymous letter stating that she was poisoned. Post-mortem evidence finds traces of a rare dental anesthetic in her body, and her stepdaughter and heir, Ada, becomes the prime suspect, since she works in a dental office with her fiance. Can Mr. Jellipot solve the crime and block the couple's arrest?--for murder!