New short story or book idea?

It never ceases to amaze me when an idea for a story hits me. I was in bed last night - Monday May 9th 2016, and an idea came to me.

I don't know why these things happen like they do, but when my mind is clear (such as dozing in bed) an idea for a story began to fill my thoughts. I've even got two ideas for a title:

Rage, or The Reluctant Killer!

Which one do you like? Drop a comment (below).

I've pictured all kinds of scenario's for this book/short story and am already putting them together in a file.

I like the title: 'The Reluctant Killer' it gives a real naivety to the main character of the plot. I think this would have to be an adult novel. I'm thinking, stalking, violence, clever plotting and edge-of-your-seat suspense.

I'll let you know how it unfolds.