A woman attends her mothers funeral.
At the funeral, she meets a man. She chats with the man and gets to know him a bit better. After only a few hours of talking, the woman is convinced that she has found her soul-mate. She cannot believe how perfect the man is for her. However, she has to leave in haste because she gets a phone call. She forgets to retrieve the name or contact information of the man. She spends weeks trying to find him, but to no avail.
Three weeks later, the woman murders her sister. Why?