After a girls' night out, endearingly awkward Deb wakes up in the apartment of the most attractive guy in Portland, Maine       She's thrilled, but she can't remember much of what got her there       Pretty boy Ryan only knows it was a mistake and ushers her out the door                   into a full-scale zombie apocalypse       Now, a walk of shame becomes a fight for survival as the mismatched pair discovers that the only thing scarier than trusting someone with your life                   is trusting them with your heart