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Johanna doesn't think much about her Cousin Robert -- he seems to be rather a rascal. But when their parents go on a vacation, both children have to stay with their grandfather somewhere in Germany. Johanna finds out that Robert has different plans: He wants to discover a passage to the North Sea. And soon Johanna finds herself on a boat with three boys and a chicken called Gonzo, meeting all kinds of adventures on the river.

Frankfurt, Germany. A young French woman coming to work, Edith, discovers the city. Unbeknownst to him, an American photographer in line, and for a few dollars, delivers his photos to a shady sponsor.