Prioress Eleanor of Tyndal is recuperating from a life-threatening illness at the start of Royal's riveting fourth medieval mystery (after 2006's Sorrow Without End
), but she brightens at an assignment from her aunt Beatrice, director of novices at Amesbury Priory, who asks her to investigate a ghost people claim has begun haunting Amesbury. When a local man is found beheaded, Eleanor realizes she's dealing with a human killer, not an otherworldly spirit. Meanwhile, a thief may be trying to steal a valuable illuminated manuscript from the priory. In a fascinating subplot, a handsome young monk, Thomas, hunts down the manuscript thief. Though committed to celibacy, 22-year-old Eleanor develops quite a crush on Thomas, who struggles with homosexual longings. The author subtly treats the erotic charge surrounding Eleanor and Thomas while shedding light on 13th-century understandings of sexuality. Royal draws together the murder, the manuscript and the ghost in an unexpected conclusion. (June)