Tim Shaw has a MA in Medieval Studies, and is ABD (All But Dissertation) for a PhD in Medieval Studies. He blogs on the Middle Ages at http://dailymedieval.blogspot.com. He has a website for more background information on the history in his novels: http://www.chaucermysteries.com.
A young Geoffrey Chaucer notices three men in London who shouldn't be there. Two days later, one of them is found dead, without a mark on him, in the basement of a locked house. Curiosity and a sense of moral obligation prompt him to explore the incident. His fumbling investigations—while more basement deaths turn up—lead him to learn more about the history of England than he ever suspected.