"Langer" tells a story of a young, ambitious businessman who inherited a financial holding from his tragically deceased father. In his free time, Piotr indulges in his long-time passion - he is an elusive serial killer who has evaded prosecutors for years. One day, a stunning woman - Nina - appears in his life at a charity gala, capturing Langer's attention and eager to get closer to him. Shortly after, she finds herself embroiled in a dangerous game and a relationship with Langer, which proves to be complicated as she seeks to find evidence to prove he is a killer. Will justice prevail this time...?