One Plus One Equals Three () is a 1927 German silent film directed by Felix Basch and starring Veit Harlan, Georg Alexander, and Claire Rommer.Lamprecht, Gerhard. Deutsche Stummfilme: 1927–1931. p. 45.
The film's art direction was by Heinrich Richter.
Cast Veit Harlan as Paul Georg Alexander as Peter Claire Rommer as Anni Gyula Szőreghy as Annis Vater Margarete Kupfer as Annis Mutter Sig Arno as Doktor Planer Karl Platen as Diener Lissy Arna
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