Caterina Valente was the queen of German showbiz of the fifties. Her extraordinarily popular pop songs and dance shows made their way into the movies, where Valente often appeared in tandem with her brother Silvio Francesco. Like so many Hollywood musicals, Valente's vehicles were frequently backstage stories set in the world of entertainment. Bonjour Kathrin begins in Paris with a fruitless attempt by three young music students to mount a stage show, continues with an unexpected triumph at the San Remo Festival of Popular Song, and finally ends up back in the City of Light, where an auction is transformed into an amusing, rousing musical. Director Karl Anton's visual compositions feature impossibly rich colors and the gaudy, artificial look so admired in the fifties. The highly imaginative song-and-dance sequences effectively evoke the dream world of the period.