No Magic from Tomorrow (1979)

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.