The Devil decides to go and visit Kurfürstendamm, where all his clients seem to come from. He settles at "Pension Elvira", where everybody cheats and deceives him. He comes to the conclusion, that Hell is a much better place.

Maud Gregaards travels to China in search of a fabled treasure said to have belonged to the Queen of Sheba. Once there, she is taken captive by an evil man and nearly killed in the belief she is a witch.

Through the plan hidden in Astarte's jewelry, Maud Gregaards, Kien-Lung and Consul Madsen get on the trail of the Queen of Sheba's treasure. Their search takes them to Africa, where they want to know from King Makombe the location of the Fire Mountain, near which the legendary city of Ophir, the center of the Astarte cult, is said to be.

Together with Kien-Lung and the Consul Madsen, Maud travels to Kuan-Fu to learn from the old rabbi where the treasures of the Queen of Sheba are hidden. The dying rabbi entrusts Madsen with the jewelery of Astarte, who carries the plan for the treasure's hiding place.

Maud Gregaards tells her rescuer, the Chinese Dr. Kien-Lung, her life: Her father was an archivist in the Foreign Office who was run by the unscrupulous Dr. Frohner was blackmailed into giving him a secret Chinese treaty.