Philip St. Ives, professional go-between, is off on another adventure, this time to London. Seems a young man has found that the beat-up old sword his father picked up in Shaftsbury Avenue was really the legendary sword of the crusader king St. Louis.Too bad someone nicked it from him before he could sell it.I can't say too much, but things develop from there. The cast of typically colorful characters is large, and of course colorful, and the search for the sword is a lot of fun, though the ending is downbeat, as happens in many of the St. Ives books.