The multi-millionaire Eduard Schlüter takes part under the name Schulze in a raffle of his own Schlüter works and wins a stay at the Grand Hotel. Disguised as a poor swallower, he would like to study the reactions of the hotel staff and guests. As an assistant, he takes his reliable servant Johann with him. Once there, he makes friends and also has cause for annoyance when his daughter and the housekeeper arrive.
When Emil travels by bus to Berlin to visit his family, his money is stolen by a crook who specializes in digging tunnels. While following the thief, Emil runs into Gustav, a young boy who gathers up all his friends to help Emil find the money. However, they get into more trouble than they bargained for when Emil's pickpocket turns out to be mixed up with a couple of notorious bank robbers.
A Communist officer falls hard for a married woman trying to escape from Hungary.
