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Lewis is a border guard at a checkpoint that patrols a wall, but after a chance encounter with mysterious alien Lilyhot his life is thrown into turmoil when he discovers that he's actually half alien.

After Lilyhot reveals to Lewis that his real alien father Antoine is in prison, he agrees to help break him out. Truss starts to believe that Lewis is involved in some shady dealings.

Lilyhot attempts to persuade Antoine to take part in a gang war with Fabien, assuring him that he can retake control of Troy.

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.

Troy is put into lockdown, and with the help of Lilyhot, Lewis realises he has to bring the conflict to an end, but to do so a sacrifice must be made.