Straight is the story of a messy love triangle between two men and a woman. Nazim (Eralp Uzun) is a hot young Turkish guy involved in petty crime. He goes out each night with his buddies, cruising for girls and dealing drugs in a seedy city square populated with hookers. None of his buddies suspect that on many of those nights he ends up in the arms of men. Since he met David (Florian Sonnefeld) on the street, his hetero façade is rapidly crumbling. His friends seem to pick up on the new vibe and wonder what’s up. David is from a bourgeois Jewish family and slumming it. He hangs out on the street pretending to look for drugs, but what he really wants is Nazim. Their first hookup is alternately hot, tender and filled with guilt. Nevertheless, their affair develops in secret against all odds. Further entangling things is David’s Polish-German girlfriend (Beba Ebner), who is revolting against her strict Catholic upbringing by going out with this punkish Jewish boyfriend.

Cologne/Bonn Airport: Detective Inspector Mark Kleinert transfers the young Turkish man Baran Sahin, who has been arrested for illegal possession of weapons, to Istanbul. Seemingly a routine operation - until Kleinert receives a call from his lover Carla Paditz, urging him to meet her in Istanbul. When Kleinert arrives at the hotel, Carla is already dead. Mark Kleinert does not realize that Jo Weiß, an undercover BKA officer, is also at the hotel at the same time and is watching him. The fact that there is an even bigger crime behind the murder of the woman on the Bosporus becomes clear after the murder of the imprisoned Baran Sahin. And when Mark Kleinert wants to know why he of all people was responsible for his transfer, his life is already in danger - and not only his.