Father Raphael returns from his sabbatical in the jungle with the Niquoias head-hunter tribe, who (according to native lore) have the duty of guarding the true location of Eldorado. Raphael’s landscapes resemble the descriptions of Eldorado itself - but this becomes apparent only when the paintings are sold to rich heiress Michela, whose father spent his final days in search of the mythical place. Michela’s uncle Graziani and his ruthless henchman Rupert kidnap Father Raphael to force him to reveal where Eldorado is, bringing Orso and Zach to free their brother - and possibly recover the treasure.