The Hollow is a 1951 play by crime writer Agatha Christie. It is based on the 1946 book of the same name.
An unhappy game of romantic follow-the-leader explodes into murder one weekend at The Hollow, home of Sir Henry and Lucy Angkatell. Dr. Cristow is at the center of the trouble when his mistress Henrietta, ex-mistress Veronica, and wife Gerda, simultaneously arrive at The Hollow. Also visiting are Edward (who is in love with Henrietta) and Midge (who loves Edward). Veronica ardently desires to marry Cristow and succeeds in reopening their affair but is unable to get him to divorce his wife. Veronica unwisely states that if she cannot have him, no one shall. Within five minutes Cristow is dead. Nearly everyone has a motive and most had the opportunity. Enter Inspector Colquhoun and Sergeant Penny to solve the crime.