Four years after the events in Manscheid, Luc Capitani is working as a handyman in the station district of Luxembourg City. Until Bianca, a prostitute, hires him to investigate the disappearance of her friend Andrea. The search is cut short when Capitani locates her body in a forest, and the hunt for her killer begins. Meanwhile, Lucky Onu arrives in Luxembourg from Nigeria, to look for his sister.

　　在這個反烏托邦世界中，一種經由語言溝通散播的傳染病到處肆虐，而唯一對此疾病免疫的語言學家，正遭到暴虐無道的組織追捕。