Payback

You know when you do something that you instantly regret?
Like picking up something that doesn't belong to you,
just to have a quick look at it? Well that's how it starts for Greg.
In the park, he sees it lying there; a smooth, black oblong of glass.

But as soon as he touches it, his life is altered.
Now there's a voice in his head, and everywhere Greg looks
someone is ready to die...