When a colossal tectonic shift causes the sea level to start rising, a microbiologist gathers the DNA of as many species as she can, while the military creates an "ark" in a desperate attempt to preserve life on Earth.

Two women, one from the United States and one from the United Kingdom, swap homes at Christmas time after bad breakups with their boyfriends. Each woman finds romance with a local man but realizes that the imminent return home may end the relationship.