Brian Harwood was once a Spook's Apprentice.
Harwood was one of the apprentices for Henry Horrocks; his second to last one, in fact. He was the apprentice prior to John Gregory.
He was killed during a job, when a bone-breaker beggars terrorised the people of Bury.
John Gregory remembers his master's preceding apprentice, in an account about the Bury Boggart
in his Bestiary.