The Shadow was a popular American radio drama that aired from 1937 to 1954. The show was based on a character from pulp novels created by Walter B. Gibson. It featured the mysterious crime-fighter known as The Shadow, who had the power to cloud men's minds so they could not see him. The series was known for its thrilling plots and the iconic opening line, 'Who knows what evil lurks in the hearts of men? The Shadow knows!' "The Death Triangle" is an episode of The Shadow that aired on December 12, 1937. In this episode, The Shadow investigates a series of mysterious deaths linked to a group known as the Death Triangle. The story unfolds with Lamont Cranston and his assistant Margot Lane getting involved in a web of intrigue and danger as they uncover the secrets behind the deaths. The episode is remembered for its suspenseful narrative and the clever unraveling of the mystery.