Seagal is Nico Toscani, an Italian immigrant, American patriot, ex-CIA agent, aikido specialist, and unorthodox Chicago policeman. He is as committed to his job as he is to his personalized brand of justice: expert and thorough bone-crushing.

Below the streets of New York is a dark and dangerous world hidden in the shadows of abandoned subway tunnels and miles of forgotten infrastructure. When a young documentary filmmaker goes into these tunnels to uncover the unseen stories of the people living below our feet, she finds out that there is more to be afraid of than the dark. A mysterious figure, living beyond the reach of the law, has declared war on the outside world that threatens to tear apart the fragile underground society living in the tunnels and maybe even the city above it.

Situated just above the awe-inspiring Ipanema beach in Rio is the Cantagalo slum. Every day, floods of Cantagalo residents make their way down the mountain, only to disappear into their surroundings as part of the invisible working-class that cleans apartments, works in restaurants, and sells food along the scenic, sun-drenched shores. Young Dé (Thiago Martins) is just such a man. Dé lives with his mother Bernadette (Cyria Coentro) in a cramped Cantagalo apartment, selling hot dogs on the beach in order to make the rent. His brother Beto was killed when Dé was just a young boy, and his adopted brother Carlão (Rocco Pitanga) has been jailed for a robbery that he didn’t commit. One day, while working on the beach, Dé meets Nina (Vitória Frate). Nina is the only child of a successful lawyer named Evandro (Paulo César Grande), who’s none to happy to discover that his daughter is dating a member of the lower class. How…