When a global virus wipes out most of the population, those who survive are left to fend for themselves in a rapidly disintegrating and increasingly violent world.

Around the resolute Abby, a devoted mother with a missing son, a group gradually gathers in a struggle for survival. They include Greg, a longer, hiding the pain of his past; Anya, a doctor who has seen too much; Al, a playboy who becomes surrogate father to the young Najid; the attractive but spoilt Sarah and Tom, handsome, urbane but unbeknownst to the others, a high security prisoner before the virus hit.

Finding food and shelter are not their only concerns. Rogue groups and individuals are taking advantage of the anarchy; the only surviving government minister, Samantha Willis, is establishing a ruthlessly controlled community and a fanatical group of scientists will stop at nothing to find a vaccine.

In a dangerous and isolated world, the group must decide who to trust and just how to survive, as they struggle with the trials of day-to-day existence and attempt to build new lives