Selena and Julie are sisters. As children they were close, but as they grow older, a rift develops between them. There are greater rifts, however. Julie goes missing aged seventeen. It will be twenty years before Selena sees her again. When Julie reappears, she tells Selena an incredible story about how she has spent time on another planet. Does Selena dismiss her sister as a the victim of delusions, or believe her, and risk her own sanity?