Returning to New York from a family vacation in Jamaica, the Stone family is separated when adult siblings Michaela and Ben, along with Ben's gravely ill son Cal, are bumped to a later flight, while Ben's wife, daughter and parents fly ahead. When that later flight lands, the passengers are bewildered to discover that five and a half years have gone by. They attempt to reconnect with the loved ones who mourned their passing and moved on long ago, and try to make sense of a mystifying phenomenon steering them to act in ways they don't understand.