Richard loses his wife Carrie in a horrible accident. Carrie's sister Laci helps him cope with his loss and she moves in with the family to take care of the children. Along the way she falls in love and becomes obsessed with Richard. But he starts seeing a woman named Nicole and soon decides to marry her. Laci is offered to be the maid of honor at the wedding. However, she becomes determined to stop Richard from remarrying, even if it means she has to commit murder.