"Hand and Ring" is a mystery novel written by Anna Katharine Green. The story follows the investigation into the murder of a wealthy businessman who was found dead in his study. The only clues to the murder are a handprint and a ring found at the scene. The novel is notable for its use of forensic evidence, which was a relatively new concept at the time of its publication. Green also explores themes of class and gender, as the investigation reveals the secrets and scandals of the wealthy upper class. "Hand and Ring" is considered a classic of early detective fiction and is credited with influencing the development of the genre. It's clever plotting and engaging characters have made it a popular and enduring work of mystery fiction.