Falsely accused of murder, Balthazar (Tomer Sisley) is on the run, while his colleagues on the police and at the Forensic Institute have been suspended. When a diabolical killer emerges, Balthazar comes out of hiding to set things right.
On the run in Marrakesh, Balthazar feels responsible for the murders committed by his brother, Alexandre. Upon learning that Camille, Delgado, and Olivia have been suspended for not catching a criminal terrorizing Paris, Balthazar returns to help.
Under house arrest, Balthazar passes the time by spying on his neighbors and witnesses a teenage boy hanging himself with a duck mask over his face. Meanwhile, a figure in a duck mask kills three strangers in Paris. Is there a connection?
While performing a postmortem on an elderly lady, Balthazar finds a bomb with a timer inside her body. After Camille helps him defuse it, they realize the bomb was set to explode during the woman's funeral, making her family the targets.
When a minibus is found in a field with its six passengers missing, the driver mentions seeing a bright light. Could it be aliens? Things get even stranger after mutilated bodies turn up in a crop circle nearby-but not the people who disappeared.
A father, mother, and son are executed at a roadside rest stop, but it turns out the victims were posing as a family to transport drugs-which are now gone. Following the trail back to the dealer, Balthazar and Camille wind up in a dangerous contest.
Maya escapes from prison with Alexandre's help. Their plan becomes clear when Camille wakes up in a coffin six feet under, with a live video feed playing at the Institute. But that's only the start of the deadly game between the Balthazar brothers.
