A group of friends on a weekend getaway are caught between a hulking serial killer and one of their own possessed by a recording of an ancient ritual.

Jean-Jacques Daloiseau has worked as civil servant in the Ministry of Health and his now retired.Jean-Jacques and his old friend Robert have always dreamed of a sailboat and a trip around the world by sailboat.They have found a nice sailboat: Robert has paid his part but Jean-Jacques needs to sell a ground in the Soth of France.And also Jean-Jacques needs to speak with his wife Carole about this trip around the world with Robert.Then begin all the difficulties and impediments.Carole doesn't agree with this and runs away to London.Then one daughter ,Pauline, has problems with her husband and has come back home with her children.So Jean-Jacques becomes a nanny and has to solve all the problems of his daughters, find the money for boat and recover the love of Carole.