A serial killer is arrested and, to clear his name, commissions skilled assassin Samuel Delaunay to carry out a murder replicating his sadistic ritual of shaving his victims' skulls after the killing

A woman hires Samuel to assassinate her boss, a plastic surgeon whom she's accused of sexual abuse. When Lauren finds her son Arthur playing with a gun, she turns to her neighbour Charlotte for help.

Franck Peszynski, a casino owner who ordered the murder of Samuel's wife Lauren, returns and discovers that she's still alive. Samuel's mother Natacha sends him to kill an editor and fake her suicide.

A representative of a bank in Luxembourg needs Samuel to dispose of an MEP who is proposing to regulate tax havens and then make the death look like an accident. Natacha meddles in her son's marriage.

When Samuel realises that Natacha has delivered Lauren to Peszynski, he is furious and heads off to rescue her. But at the rendezvous, the French intelligence services give him a terrifying ultimatum.

A fugitive gives Natacha and Samuel a new contract: to kill the person who betrayed him to the police - his own brother. A persistent Peszynski discovers the connection between Natacha and Lauren.