Bunker 10, J.A. Henderson

A handful of genius teenagers who live on a hidden military base are hatching an elaborate escape plan so that two of them can go on a date. What they don't know is that deep below, on the tenth level underground, a dangerous experiment has mutated one of them beyond recognition, and she is desperately trying to escape and wreck havoc on the world. * Okay, so don't read this if you're looking for something deep. But it will keep you guessing until pretty much the last page - lots of fun twists and turns. The body count is pretty high, but the gore factor is fairly low. Good for non-sci-fi fans too.