After a bachelor party, a suspended German federal cop is pulled out of the Vltava River in Prague. Because he speaks Czech, federal inspector Jan Koller is sent to investigate his colleague's death and keep any embarrassing details under wraps. So he has to go to the Czech Republic, where he grew up and has very bad memories of. He accepts the assignment reluctantly. In Prague, the theater-loving..

When Koller finds out his father, who he thought was dead, is alive in an old age home, he goes to visit the old man, only to wake up in nothing but his underwear, lying on a dead body – who happens to be an old enemy of his dad's. The Czech inspectors Kafka and Klára suspect Koller, while he has to face the fact his father is a liar and a cheat. Koller and Klára go undercover..