The Sealed Book was a spine-chilling radio series of mystery and terror tales aired on the Mutual network from March 18 to September 9, 1945. The show's format consisted of weekly Sunday night broadcasts, each beginning with the ominous sound of a gong. Host Philip Clarke would introduce the stories, which were primarily tales of murder, madness, and dark, terrifying deeds. The show featured a distinctive introduction and conclusion involving the mysterious Keeper of the Book, who held the secrets and mysteries of mankind.

Although there were no recurring characters in the series, the writers, Robert Arthur Jr. and David Kogan, often reused character names between episodes. The Sealed Book also made use of organ solos, offering moments of both suspense and commercial breaks. Fans of horror and mystery radio programs will find The Sealed Book to be an engaging and thrilling listen, reminiscent of other contemporary shows like Lights Out and The Inner Sanctum.