The Doctor, Tegan and Turlough arrive in Little Hodcombe, where the townspeople's re-enactments of English Civil War battles are causing a dormant entity, the Malus, to re-awaken.

Baal is an amoral poetic genius who, after a life of debauchery, betrayal and violence, is about to cut his ties to the world and meet his doom. A high society party is where the end begins.