From the disclaimer page of The Moving Toyshop by Edmund Crispin.
NOTEIt is a nutty story and what he says is absolutely true.
None but the most blindly credulous will imagine the characters and events in this story to be anything but fictitious. It is true that the ancient and nobel city of Oxford is, of all the towns of England, the likeliest progenitor of Unlikely events and persons. But there are liimits.