I'm working on my second movie script, and was curious what you think of the idea (SPOILERS!).. basic plot:

A guy, in the army, goes overseas to fight in the war. He writes letters to various people that's in his life (wife/girlfriend, parents, friends, etc.). When he gets to go back home, he's greeted by FBI(?) for questioning regarding murders. He's informed that everyone that he knows has been killed by a serial killer and they question anyone he may know.. etc.

He goes out looking for the killer and trying to solve the puzzle. Eventually, he locates the killer and gets knocked out by a weapon. When he awakes, he's in a room handcuffed to a chair wearing white clothes with the killer dressed in a suit. They are sitting at a table, like a police questioning room somewhat.

It's revealed that the 'army' guy is actually the killer, but the only way he could kill was to place himself somewhere else while he did the killing. The killer he's searching for and finds.. is actually a psychiatrist who is trying to figure out why he did it at the end.

And bring in the thoughts...