Peter Tremayne is the alias used by Celtic scholar Peter Berresford Ellis (b. 1943) for his mystery and weird fiction. The author of over sixty books, Tremayne is currently best known for his series of historical mystery novels featuring Sister Fidelma, which began with Absolution by Murder (1994). Fidelma is both an Irish princess and a qualified dálaigh, or advocate, of the law courts of Ireland under the ancient Brehon Law system. In addition to the series of novels, earlier Fidelma stories will be found in the collection Hemlock at Vespers (2000). The following brand-new story (from The Mamoth Book of More Historical Whodunnits (2001)) is set in the year 667.