A theft at the museum! Even though the museum is crowded with visitors admiring paintings and sculptures of great artists, nobody notices that the exhibition's most famous work of art has been stolen by an unknown thief. A voice sounds from the loudspeakers — "Nobody leaves the building!" — and the player inspectors are suddenly on hand to question visitors and find important clues. An exciting pursuit for the culprit begins in Millionenruab. Who will catch him first?