Killers

Killers in thrillers are either really normal on the outside but psycho on the inside, or just plain weird, like in Wolf Creek.

 

I think the more normal a killer looks the scarier he is; again this will build suspense in the viewer. In Sleeping with The Enemy, Patrick Bergin looks to everyone as a normal person, but he bullies and terrorises his wife, Julia Roberts, so much that she pretends to die rather than stay with him. He finds out and goes to find her; this is where subtlety plays a part in the thriller; she does not know he is there, but little clues, towels moved in the bathroom, cans turned in the kitchen, and music playing tell her, and the viewer, that her husband is somewhere.