Felicia's newly discovered grandfather invites her to stay at his baronial hall to meet the scions of local families at a house party. The party is interrupted by an uninvited guest, Dean Ivo Pole, a fanatic cleric looking to root out heresy . After upsetting most of the guests, Pole has the discourtesy to be murdered on Sir Godfrey's own property; suspicion falls on the guests and indeed on Sir Godfrey's own household. Felicia and Robin must find out who brutally murdered Dean Pole, to lift suspicion from the innocent, including the local Lollards...