Octogenarian Teddy Garnett tells this story of a global flood that has left humanity in tatters. Holed up in his mountain home, Teddy and his buddy Carl Seaton struggle through daily life, puzzling over things even stranger than a 40-day rainstorm, including the giant slime-coated holes that keep showing up in Teddy's yard. Before long, Teddy and Carl are fending off man-eating earthworms the size of buses. A helicopter crash nearby brings Kevin and Sarah, the last two survivors of an outpost in Baltimore, into Teddy's story.