First I would like to get things straight. This is certainly not a comedy, and I really don't understand the rating of this film!
A film with a shark probably will have the misfortune to be compared with Jaws. Of course there are similarities, it's about a killer shark. There was a bit of comedy in Jaws, but that certainly didn't make it a comedy. The film is describing the life in a small French city with a very tourist seeking beach. We're in the city of La Pointe, not much happening, the city living off tourists.
Second in command at the police department Maja Bordenave (Marina Fois) is being told by German tourists that they have seen a shark. At the same time a man on a surfboard is missing.
The beach is closed as a leg is found with marks of shark teeths.
Maja is three days from retiring, 49 years old, starting young, but she wants to fight the shark. She is getting a week to solve the problem. With help from her colleagues Blaise (Jean-Pascal Zadi) and Eugenie (Christine Gautier) they hunt the shark down and shoot it with a tranquilliser, capturing it.
But that's not enough, soon the shark is hunting in La Pointe again. Maja is called an assassin, on the ground of more shark victims. She retires from her job.
Trying to relax with husband Thierry (probably the hardest working actor in France, Kad Merad) she really wants to end the horror and kill the shark. Nearly all in La Pointe don't want her help.
Well, that's except her former colleagues Blaise and Eugenie. The three sails out for the final fight with the shark...
I think this is much better than what has been written on this site. This is a very good movie, and really this is a very fine acting all around, especially Marina Fois.