[4] The film represented a major shift for the director, Forst, who had previously been known for escapist works such as Operette and Vienna Blood, which avoided controversial themes and embraced romanticized settings.

[5] The Sinner departed from this tradition by adopting a realist perspective, addressing taboo subjects like prostitution and euthanasia, which challenged the moral sensitivities of post-war West German society.

The couple experiences a fleeting period of happiness in Italy, but as Alexander's condition worsens, their deep love compels them to make the heartbreaking decision to end their lives together.

[4] Through its presentation of nudity, suicide, and euthanasia, the film’s debut sparked widespread contention in the tumultuous social climate of 1950s West Germany.

[4] Despite the controversy, or perhaps because of it, The Sinner marked a turning point in Hildegard Knef’s career, after which she appeared in notable films such as the American-produced Decision Before Dawn and The Snows of Kilimanjaro.