The Mysterious Stranger (1925)

Raoul Lesage suspects his wife, April, of infidelity with Herman Bennett, an artist, and forsakes her, living for the next 20 years in a hermitage surrounded by high walls. He is accompanied in this solitary life only by his young son, Paul, who, at the age of 21, has not seen anything of women or the world. One night, Paul walks in his sleep and wanders from his home. He falls into the company of his mother (whom he does not recognize), Bennett, and Bennett's beautiful ward, Helen, with whom Paul soon falls in love. After a series of thrilling adventures, Paul foils Bennett and reunites his parents; he and Helen hear wedding bells.