The episode details the unsolved Hall-Mills murders of 1922, an infamous American mystery. It recounts how Reverend Edward Hall and Mrs. Eleanor Mills, both married individuals and choir members, were found shot to death in a secluded lane, with their bodies deliberately arranged. The investigation quickly uncovered their illicit affair, leading to initial suspicion of James Mills, Eleanor's husband, and later focusing on Francis Stevens Hall, Edward's wife, and her brothers, Henry and William Stevens. A sensational trial in 1926, heavily influenced by the unreliable testimony of the "Pig Woman" and a compromised crime scene, ultimately resulted in the acquittal of the Stevens siblings, leaving the case unresolved and subject to various theories ranging from jealousy and honor killings to a broader conspiracy or robbery gone wrong.
