Hurricane Ophelia is bearing down on New York City, and in a matter of hours six people, along with their families and friends, will be caught up in the horrific flooding it unleashes. Ellen Wharton flew in from London to see her architect mother, but Grace Madison refuses to leave her apartment in the evacuation zone. British investment banker Charles Williams is looking for his daughters and ex-wife in SoHo. ER doctor Juliette Dubois fights to save lives when the generators at her hospital fail. NYU students Peter Holbrook and Ben Weiss are settled in with junk food and beer until their building threatens to collapse. And then the real challenges begin as the survivors face their futures.