Ritual was released in the year 1987。Ritual is also called as The Believers, Wyznawcy zla, Sju makterna, Pahan riivaamat, Envoûtés, Daimonismenoi, Creyentes, Believers - I credenti del male, Adoradores do Diabo。
After the death of his wife, police psychiatrist Cal Jamison moves to New York. There he has to help in the investigation of the murder of two youths, who seem to have been immolated during a cult ritual. Jamison believes it's been Voodoo and, ignoring the warnings of his housekeeper, enters the scenery and soon gets under their influence. They try to get him to sacrifice his own son.