suspenseful and gripping, but I didn't quite get the ending. nm

I'm not sure but in my opinion -as we learned in the end he lied to her- he shot her and walked away. Only his victory was of short duration as before her death she had injected him the substance he had questioned in his last quiz, so he has only about 5 minutes to live.

Maybe you already knew all that and ask yourself a totally different question: Why after she believed him would he shoot her (or she herself, maybe everything she still lived for was gone)?

If you'd be a little more specific I'd be happy to try to help.

All in all, for me the movie turned out better than I expected, as you named it above.

You have to watch it again and listen what he says when she calls his sister. The whole mystery will unfold with that one simple sentence.

I think biggun007 and shoantell pretty well cover it. One thing that may be obvious but I didn't get immediately is that I think when she says she has something important to tell him at the end, she's revealing that he's been dosed with pentothal, which he knows from the quiz show means he'll die shortly. I believe he hadn't known this (perhaps assuming the injection was more morphine as the two drugs have similar effects) and that *this* is why he shoots her even though she's been totally convinced of his 'innocence'. If he'd been immediately aware there would have been no need to continue his charade.