One Corpse Too Many, by Ellis Peters

This is the second in the mystery series featuring Brother Caedfell, a well-traveled monk who makes use of sharp skills of observation to solve mysteries.  These stories are set in the English middle ages, and Peters does a great job of making the setting, characters, and Brother Caedfell's detective role believable.  This is a fairly straightforward murder mystery, but also involves some intrigue over the rivalry for the English throne.  A fun read.  188 pages.