In defiance of all the laws of physics Mr. Tau is walking on the wing of an aircraft flying close to Prague. Young Alenka is enthusiastic, but the other passengers are horrified. The security inspector Málek believes the report from the crew to be a code alerting him to a hijack, and orders an emergency landing. In the confusion at the airport the fairytale Mr. Tau disappears into one of the halls.

Mr. Tau, the quiet and kind magician with a bowler hat and an umbrella, shows up unexpectedly on the wings of a plane during flight. The terrified crew contact the airport security service. After the plane lands, Mr. Tau disappears. The third security inspector Málek is determined to catch the hooligan at any price. To achieve this, he gives up his holiday to visit the children's summer camp. Mr. Málek's son, who just like all the other children is delighted by the new camp cook, Mr. Tau himself, has unknowingly set the inspector on the magician's trail. But the children at the camp are determined not to let their beloved magician get caught and ingeniously place all sorts of traps in Inspector Málek's way.

Pan Tau, the friend of all children, now also helps the adults. A movie producer is in trouble and decides to shoot another Pan-Tau movie. But the old Pan-Tau actor Karasek is no longer young enough to walk the almost weightless walk of Pan Tau. Mr. Novak turns up - he resembles Pan Tau like a twin brother. He succeeds every pirouette. And as if by magic, he solves all the problems between people! Who is Mr. Novak? Is he really ...?