"Die Mamba" is a top international terrorist. A deadly hand-to-hand fighter, sniper, explosives expert and master of masks and deception. Hossein Sarivi is a good husband and sound designer in a cookie factory. The two look very much alike, but their lives have had no points of contact. Until now...

Having just arrived in Vienna, eight-year-old Tao is forced to watch as two men murder his relatives in their Chinese restaurant. The killers catch him too, but the boy manages to escape. When Ester, who has recently gone blind, crosses his path, he follows her into her apartment. Unfortunately, the strange woman doesn't understand his excitement. Meanwhile, LKA officers Decker and Kriesch take over the murder case. Not at all reassuring for the witness, because the two killers and the two officers are one and the same person...