The Adventures of Philip Marlowe was a radio drama series based on the famous fictional private detective created by Raymond Chandler. The series features the tough and intelligent private investigator, Philip Marlowe, who solves complex cases in the gritty and crime-ridden streets of Los Angeles. Known for its film noir style and hardboiled detective stories, the show captivated audiences with its thrilling plots and sharp dialogue. "Sound and the Unsound" is the 114th episode of The Adventures of Philip Marlowe, originally aired on September 15, 1951. In this episode, Marlowe is hired by an elderly landlady to investigate a strange tapping noise in one of her tenant's apartments. As Marlowe delves deeper, he uncovers a mysterious shooting and a web of deceit, leading to a thrilling pursuit to uncover the truth.