Five teenagers with different personalities are introduced to one another in a chatroom called "Chelsea Teens!" But one shows its darker side, threatening the others' lives.

Life for former United Nations investigator Gerry Lane and his family seems content. Suddenly, the world is plagued by a mysterious infection turning whole human populations into rampaging mindless zombies. After barely escaping the chaos, Lane is persuaded to go on a mission to investigate this disease. What follows is a perilous trek around the world where Lane must brave horrific dangers and long odds to find answers before human civilization falls.

Follows a pious nurse who becomes dangerously obsessed with saving the soul of her dying patient.