Pride and Prejudice and Zombies

The story opens with newly married protagonists, Elizabeth and Fitzwilliam Darcy, defending their village from an army of flesh-eating unmentionables. But the honeymoon has barely begun when poor Mr. Darcy is nipped by a raging dreadful. Elizabeth knows the only acceptable course of action is to promptly behead her husband (and then burn the corpse, just to be safe). But when she hears rumours of a miracle antidote being developed in London, she realizes there may be one last chance to save her true love - and for everyone to live happily ever after.