#5 Bascot de Marins "Templar Knight" mystery set in 1194 Lincoln UK and surrounding area. When a local prostitute is murdered and stashed in a chest in the Templar's chapel, everyone is firstly aghast that someone could get into the enclave unobserved and commit such a heinous crime under the Templars noses, and also that anyone would want to. Bascot de Marins, set to leave Lincoln for Portugal in just a few days, is asked to undertake the investigation for the Templars, working with the Sheriff on the secular side since the victim was a Lincoln citizen.
A second body with the Templar sigil carved on the whore's belly confirms that there is a serial killer about with a grudge against the Templars--or perhaps it's one of the Templars themselves? Bascot works with the Sheriff's men--whom he'd investigated earlier cases with when he was a retainer of castellan Nicolaa de la Haye before rejoining the Templars--and even a little help from Gianni, his former servant now training as a scribe in de la Haye's household.
I enjoyed this entry in the series with the historical detail, although I still don't feel that Bascot is a fully developed character yet. Characterization seems to be this author's weakness, as well as a somewhat pedestrian writing style, and yet the books read quickly and tell an interesting story.