1.
It's sounding pretty familiar...
It seems like you may have a cliche on your hands!
Whether your conflict, character, or setting, something is matching up to many other things written/produced before your story. Hey, maybe you got the idea while interacting with a similar story and your mind created an awesome twist. Twist or not, however, it's still to cliche to really be original.
But, that doesn't mean it won't sell, if that's your ultimate goal!