Sappho English title Mad Love is a 1921 German silent film directed by Dimitri Buchowetzki and starring Pola Negri as the title character. Alfred Abel, best known for his role as John Fredersen in Metropolis 1927, appears in the role of Andreas De La Croix, the insane brother.
Sappho casts off her previous lover, an automobile company owner named Bertink, as she does. Richard and Sappho run off and engage in an affair. In the midst of their escapade, Bertink approaches Richard and lets him know that the woman he is with is the same one that drove his brother Andreas insane, and that he, Bertink, is the man that she left Andreas for. Richard is horrified and immediately terminates his relationship with Sappho.Sappho tries to return to Bertink but is turned away, so she seeks out Teddy, Richards manabouttown friend, and starts a rebound relationship with him. Meanwhile, Richard returns home to marry his childhood sweetheart, but then balks at the wedding supper and runs off in search of Sappho. All this time, Andreas, the mad brother, is having troubled dreams about Sappho in the lunatic asylum where he is kept. When Richard starts on his search for Sappho, Andres intuitively senses that someone is going after her, so he breaks out of the lunatic asylum and also starts to search for Sappho. ........
Source: Wikipedia