At the beginning of the 20^th century, on the island of La Réunion, five teenagers of good families, in love with the occult, commit a savage crime. A Dutch Captain takes them in charge for a repressive cruise on a haunted, dilapidated sailboat. Exhausted by the methods of the Captain, the five boys prepare a riot. Their port of call is a supernatural island with luxuriant vegetation and bewitching powers.