At first glance, Carter Cross and Josh Lessard seem like an ordinary couple. They make love and fight, know each other's strengths and weaknesses, deal with the "in-laws," and share their life and home. They even work together. One day, they'll probably die together – possibly a lot sooner than they'd prefer, given their profession as members of a paramilitary special unit formed to thwart a gory apocalypse. While Carter and Josh are used to cheating death on a daily basis, this time the odds are stacked against them. Between a deadly mission to complete and Josh's grandma coming for a visit, it'll take a miracle to get them out as horror invades not only a major city but also their home.