The Lady.

A young woman marries the wastrel son of a British aristocrat. Her husband, who has been disinherited by his father, loses what little money he has left gambling in casinos and then dies, leaving her penniless and with an infant son. When her former father-in-law tries to get custody of the child, she leaves him with a couple she trusts, but when she later goes to reclaim her son, she can't find the people she left him with.