Fred, Achille, Max and Belette form a good-for-nothing gang of crooks. Dismally failing their last raid, they decide to get back in the game, kidnapping Sophie Marceau.

When his father passes away, a dentist in Paris inherits a plot and the will to build a house on it. The situation becomes tricky when he learns the plot is located in Corsica.

Based on a true story : the discovery of Lava's treasure, in 1985 near Ajaccio.