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The scatterbrained archivist of Cologne Cathedral is sent to Africa to retrieve the largest diamond in the world, on which the cathedral once rested and whose absence is now causing the foundations of the building to sink. In his wake, shady characters appear who are also after the precious stone. But there are also helpers who are well-disposed towards the adventurer against his will.
Berlin photographer Julia Sandberg has fallen in love with the charming adventurer Percy van der Walt, who has an extremely unusual job. Percy is diving for diamonds off the coast of the South African port town of Port Sheldon. Julia wants to record this exciting work, in which he penetrates to the bottom of the sea every day at great risk, in a photo book for which she has already found a publisher. But no sooner has she followed the man of her life than Percy shows a completely different side of himself: he is uncharming, selfish and at times treats her like air. He also refuses to take Julia on his boat to take photos of the diamond divers' work.
