In a secluded forest, a bourgeois couple's architectural home is invaded by a hooded assailant who violently sequesters them. His true motives remain unknown - theft, assault or something entirely unexpected.
Lisa inherits an abandoned house from an unknown benefactor. On her first night in the house, after hearing noises, she knocks a hole in the wall and crawls through to discover an inescapable, infinite, labyrinthine "house."
Several notables from the Chamonix region are found murdered in their homes. To move forward with investigation, police captain Thomas Delhaye decides to release Juliette Hémon from prison, imprisoned for a strangely similar case...
Mila is a cop and she's back in Marseille after a few years away. She's a loner, damaged and always on her guard. She's looking for her father, whom she hasn't seen for fifteen years.
After making contact with Gabriel, Claire is determined to get the truth from him no matter what it reveals. Claire's determination has alerted someone else from Gabriel's past to his whereabouts and that may prove dangerous to her entire family.
Claire helps Gabriel on his mission to stop the attack on the Al Razah power plant by introducing him to its chief of cyber security. Gabriel finally meets his son. Meanwhile, Asgard is insinuating itself deeper into Claire's personal life, and Lukas is becoming suspicious.
Claire goes undercover to help Gabriel steal credentials from the mole to get inside the power plant. Lukas needs to decide the fate of his marriage to Claire.
Claire uses the mole's credentials to gain access to the power plant. She's the only one who can prevent the meltdown. Back at the safe house Claire and Gabriel finally let their guards down.
With the power plant still under threat from a remote detonator, Claire and Gabriel must keep the device from being sold to the highest bidder. Zack gets caught in the middle of everything.
2010: mobster Tony joins his cellmate Kenz, a small-time delinquent, when he escapes from prison. Once free, Tony realizes he can trust no one and recalls his first steps as a gangster in the 1950s.
2010: In hiding and in desperate need of some cash, Tony is forced to team up with Kenz and his posse to take part in a hold-up. Back in 1960, young Tony is betrayed during an assignment in Marseille.
1965-1970: On the orders of his boss Balducci, chief of the Marseille underworld, Tony is promoted and teamed up with Guido. In 2011, Kenz holds a party that ends in the death of a rival gang member.
1982-1983: Having become a respected figure in the criminal underworld, Tony meets Claire, the love of his life. In 2011, Guido and Tony plot to take back their casino The Memphis from the Balduccis.
In 2011, in retaliation for being scammed by Tony, the Balduccis kidnap Claire. In 1983, Guido and Tony organise a jewellery store hold-up that ends in a police raid, but Tony just manages to escape.
1970-1978: Tony starts a drug dealing business and meets Olga, who helps him to obtain The Memphis gaming club and become a casino owner. In 2011, Tony sets off in search of his old friend Guido.
