The external walls of the church are decorated with carvings of skulls and bones and there is a room within the church that houses a tall wooden cabinet with glass doors. You can see the contents of the cabinet. Priests of this particular brotherhood were kept in the cabinet dressed in their cassocks. Forgive me when I say the obvious but I believe I have found the Catholic 'skeletons in the closet'.
My thanks to the priest on the left who turned to me and smiled when I took the photo.