Flower of the Dusk.

Blind Ambrose North is tormented by the suspicion that his wife Constance committed suicide when their crippled daughter Barbara was only two, because she did not love him. Before her death, Constance wrote Barbara a letter to be opened on the girl's twenty-first birthday, but when Barbara opens it and learns that her mother killed herself to escape a doomed love affair with Lawrence Austin, she invents a different story for Ambrose, knowing that the truth would hurt him too deeply.