The Rose Rent
by Ellis Peters. This is the thirteenth of the Brother Cadfael mystery series. In this installment, murder and
abduction surround the execution of a business arrangement between a young, wealthy, widow and the abbey. Brother Cadfael and
Sister Magdalan (who shows up from time to time, originally in Monk's Hood) team up to help protect the widow
and solve the mystery. This one has a very satisfying ending.