D'Artagnan, the famous musketeer, has a son who does not feel like following in his father's steps. For the time being he is a novice in a monastery. But when a King's courier, pursued by a bunch of killers, takes refuge in the monastery, things change. All the more as the murderers try to get rid of him. Raoul decides to react and set off in search of adventure - after a few fencing lessons of course!