Night Sky follows an older pair who realized that their premises had a way through to another planet in their infant years. They decided to keep the other world a secret, but having grown older, hiding it is more difficult with their neighbor and granddaughter bothered with their odd habit of sneaking around the premises at night.
The couple starts to think that it may be time to tell the secret to someone, which becomes more urgent when they realize someone else, a man, Jude, is in the portal. The triad's chronicles are intertwined with that of Stella and Toni, an Argentinian mom and daughter, because of the mysterious workings of the other planet.