In the near future, Stella and her fiancé, Bryan, are waiting at their remote cabin for Stella’s estranged twin sister, Cassie. Raised by their astronaut father to be NASA scientists, the twins have taken different paths: Cassie has just returned from a successful moon mission, while Stella has left NASA behind. When they reunite, old conflicts reignite, forcing the sisters to choose between staying on Earth or pursuing a future in space, as humanity’s fate hangs in the balance.