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|title=An Unholy Alliance

|sort=Unholy Alliance

|date=June 1997

|isbn=0751519359

}}

It's 1350 and Cambridge is suffering in the aftermath of the Black Death which killed vast numbers. It isn't only the citizens of the town who have died - there's now a desperate shortage of physicians and Matthew Bartholomew is working hard to train men to take their place. His work is important to him and he's reluctant to become involved when the body of an unknown friar is found in the University chest but has no choice in the matter. The friar is not the only unexplained death in Cambridge, but the local sheriff seems unwilling to investigate the deaths of local prostitutes. Bartholomew is convinced that witchcraft lies behind the murders.