Good Horror Book Names?

I'm making a horror book about a girl who is 15 and her older twin brother. I was thinking of something like Pull The Trigger: Twin Psycho Murderers for the title. I thought it was good. Because in the story, Livia (the main girl) first kills her drunken father with a gun. And her last kill will be with a gun. But the problem is, a gun is only of of the many weapons they use in the story. So, have any good ideas? I want to keep the 'Twin Psycho Murderers' part, but if you can think of a better full title, I'd take it. It'd be a REALLY big help! [:
Asked Jun 19, 2013

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