Black Dawn.

A happy couple on honeymoon, Vándor László and his wife, Veronika, are travelling to Triest on the express train. The train derails, she dies, while he loses his eyesight. The international adventuress, sitting in the same compartment, lends him a helping hand to calm the unfortunate man and László believes her to be his wife. On the advice of the doctors, she keeps on playing the role of the deceased young woman and stays with him until he is operated.