This one's going to be tough, because I won't necessarily be able to say "Yes! That's it!" when the right answer comes around. It's been too long. It's an older, perhaps spy-ish movie, in which the main character wears a mask due to some accident or something. Throughout the whole movie we're flashing back and forth waiting to see if the guy really had survived in the past, and therefore is who he says he is in the present, or if he died in the past, and is an impostor double-agent type in the present. Anyone?