Katherine had been pretty desperate for money in the tough job economy. She had taken a job wearing a skimpy outfit to distribute pamphlets on the subway. It was tough work. She was on her feet all day and felt exposed. After a few weeks, she was exhausted. It was on one train where she noticed an old man. She didn't usually take note of anyone, but his smile seemed strangely inviting. She leaned over to give him a pamphlet and felt strange.
When the old man had spied Katherine, he knew she was perfect. She was young, and he suspected that a sudden change in her personality wouldn't be noticed by many. He knew he was going to steal her body and take it for his own. It was his opportunity for immortality. He smiled at her. It drew her attention. In a matter of moments, he would be her.