School for Spies The Bishop orders Unwin and Matthew to investigate the sabotage of several military installations. After tracking down Brother Gregory, a Christian layman who was involved in a car accident near the scene of the latest attack, Unwin slips the miniaturised Matthew into a briefcase belonging to Gregory's associate Brother Thomas. Arriving at Pennydridge Seminary, Harding discovers that the brothers are actually mercenaries who answer to their own Archdeacon.