The Reverend Justin Somerton, a scholar of medieval history, and his protégé Lord Peter Dattering are visiting an abbey library. While studying a stained glass window, they uncover clues leading to a treasure hidden by a disgraced abbot.

Hamlet, Prince of Denmark, returns home to find his father murdered and his mother now marrying the murderer... his uncle. Meanwhile, war is brewing.

A research team from an electronics company move into an old Victorian house to start work on finding a new recording medium. When team member Jill Greeley witnesses a ghost, team director Peter Brock decides not only to analyse the apparition, which he believes is a psychic impression trapped in a stone wall (dubbed a "stone tape"), but to exorcise it too - with terrifying results...