Danny LaBelle is to wed Monica Johnson on the island, but flirts with host and maid of honor Claire La Foret, while embarrassing his nerdy brother Sam, who has an eye on Claire. After a cocky confrontation in the forest with Claire's dominant ex Jeff Doyle, who just returned to the island and soon seduces her again, Danny disappears. Claire keeps that quiet as the guests arrives and keeps searching for the groom, who has been kidnapped by a masked, abusive man.
Tycoon grandpa La Foret revives his family's traditional Christmas gathering at the lodge Claire manages for him, five years after it ceased with the mysterious lake drowning of his daughter Anne. But it's a one-off, as he has terminal cancer. The traditional treasure-hunt will now designate his sole major heir. The relatives can set aside their mutual conflicts and team up, or waste their chances. Grandpa dies during the game time, but Sergio Boniti, his Venetian new personal assistant, is authorized to supervise the game before the professionals arrive. However Anne's death haunts the game, which already has her memory as theme.