The Oxford Murders by Guillermo Martinez

This is a very good murder mystery set in Morse country. Well written, nicely paced and well translated from the Spanish by Sonia Soto. The unnamed hero, like the author, is an Argentine mathematician who is in Oxford as a post graduate student. Returning to his lodgings he meets the famous mathematician Arthur Seldom on his doorstep but when they enter they find the landlady murdered. Now follows a search for a murderer who appears to be using a mathematical theorum to plan his killings and Seldom and the narrator are swept into the investigation. Martinez concludes his story with a stunning twist, one that would not have been allowed in the "Golden Age" of detective fiction.