Having agreed to furnish Ralph Peagram's daughter Amanda's new house after her marriage to philandering Roger Hall, Lovejoy attends the wedding and overhears Ralph and Roger argue. Soon after the reception, Roger disappears and Lovejoy discovers his corpse in a suit of armour, though when the police arrive it is nowhere to be found. At Amanda's request, Lovejoy sets out to solve the mystery, which has its roots in an incident of accidental death and blackmail dating back a quarter of a century.
—don @ minifie-1