Lewis is a border guard at the checkpoint that patrols the wall, but after a chance encounter with mysterious alien Lilyhot his life is thrown into turmoil.

When Lilyhot reveals to Lewis that his real alien father is in prison, Lewis agrees to help break him out, but he ends up wondering if it was really such a smart idea.

Lilyhot tries to persuade Antoine to start a gang war with Fabien, but he isn't interested and quickly sees Lilyhot's ulterior motive to take over the city.

Truss follows Lewis to Troy, where he discovers that Lewis is half alien, but the Alien League spots Truss, which puts him in grave danger.

Dominic is forced to become a hitman, while Lewis is blaming himself for what happened to Truss. In Troy the gang war between Antoine and Fabien is escalating.

With gang war raging, Troy is put into lockdown. Lewis realises that he's got to bring the conflict to an end, but in order to do so a sacrifice must be made.