Pretty young Judith and her chauvinistic husband, while in Rio on holiday, meet another couple who introduce them to the native religion, a mixture of African tribal beliefs and Christianity. Peter is taken violently ill at a seance involving Eshu, the demon king and after their return to New York, his personality changes completely. Judith begins receiving odd phone calls, strangers approach and say weird things and she begins to realise these incidents are all connected. She asks her best friend Benita, who is writing a book on the myths of West African tribes the Yoruba, with the help of a West African diviner. The diviner tells her that Eshu has taken possession of Peter and Judith is in great danger. In an attempt to rid Peter of the spell, Judith sparks off a chain of voodoo violence - animal sacrifice, the horrific death of her closest friend and the raising of the god Yenana - the patron of all who wear blue...Judith's favourite colour ...