I am looking for the name of a movie about a older well to do lady who is looking for her sister or sisters she got separated from when she was a small child from another country. A woman goes looking for this woman's family but wherever she goes there's murder. It turns out that there is a priceless heirloom involved and the friend of the family was keeping it hidden and is willing to kill for it. One or the other sister(s) have around their necks either a key or a heart necklace. The woman who goes looking for the well to do woman falls in love with this other man who is also involved in this plot. They too are shot at. They also travel on a train together and try to figure out what info they share.