Of the chronicles of Brother Cadfael that I have thus far read, "St. Peter's Fair" is the most "mystery-like." No cut and dried solution springs to mind as the plot unfolds. This one had me guessing for some time.
All the regular ingredients of the previous stories are here: Political wrangling, personal intrigue, a love story, and of course--a murder.
Cadfael once more is a treasure trove of wisdom. Some of his lines here are classic. Cadfael is a very noble, very humane, world-weary protagonist. Ellis Peter has truly created a detective for the ages in him.
In "St. Peter's Fair" Cadfael is up against one heck of a baffling case. He and Hugh Berengar (my favorite secondary character) team up to try and solve the murder of a visiting merchant. I have no desire to give the ending away. I will only say that "St. Peter's Fair" has the added bonus of a chase scene.
"St. Peter's Fair" is a worthy entry in this series. The more I read of Ellis Peters, the greater my respect for her becomes. I recommend this book highly.