Having discovered that George was in prison with Hayden Price and is now teaching him to read Sir Arthur meets - through the late Bostock's son Harry - Fred Brooke. He establishes that, as schoolboys Harry, George and Fred fell foul of a violent class-mate known as Speck. Sir Arthur's enquiries lead to the adult Speck, who would seem to be the true culprit of the crimes for which George was blamed - though it is too late to convict. However Sir Arthur has great difficulty in convincing the bigoted police that they arrested the wrong man, particularly as Speck had an alibi for some of the crimes. Clearly he had an accomplice and Sir Arthur must unmask them before he finally exonerates George and invites him to his wedding with Jean Leckie.
—don @ minifie-1