Adrift in New York

Adrift in New York involves the disappearance of a son from the household of his wealthy father, John Linden. The boy has been kidnapped by the villainous Curtis Waring, John Linden's nephew, who hopes to inherit the family fortune.

Grown up, the youngster lives a precarious life on the streets of New York. When Linden's ward Florence rejects the unwanted attentions of Waring, she is disinherited, forced to live in a tenement and work in a sweatshop ... until it is discovered that the young man who befriends her is, in reality, Linden's long-lost son. (Goodreads)