The Holy Thief is a medieval mystery novel by Ellis Peters set in 1144–1145. It is the 19th and penultimate volume of the Cadfael Chronicles, first published in 1992. It was adapted for television in 1998 by Carlton Media for ITV. Heavy rains flood the river which in turn floods the Abbey, threatening the precious reliquary of Saint Winifred. When the waters recede, the saint is gone, beginning a long search with tangled motives, including a murder that challenges the monks.