Or maybe not. Where there is a last man, can a last woman be far behind? And as has been the pattern in such movies since The World, the Flesh and the Devil (1959), the newcomer is not just of a different gender but of a different race. Anna (Alice Braga) arrives with her own kid in tow, but the old conflicts the human intruders muster up are not sexual or racial but ideological. Anna believes that God speaks to her, that she has a mission, that a colony of the immune exists in the mountains of Vermont. Neville doesn’t buy it; he sticks to his secular rationalist convictions as he plods, without hope, toward an illusory cure. I won’t give away who wins the argument, but Bob Marley’s sublime “Redemption Song” plays at the end with a special irony.