Mine engineer Jean Roland's son Pierre and his teenage mate, Albert Letong's son Fred, are bored having to spend the summer holidays with their colonial parents. Drinking and car racing cockily are bound to go wrong, but Guy's forensic investigation may run out of time. Helene proves she can neither run the plantation intelligently, nor handle the superstitious black staff. Luckily, Guy thus gets a brand-new second-hand 'cursed' car.