Cee has been trapped on an abandoned island for three years and seventeen days without any recollection of how she arrived, or memories from her life prior. All she knows is that somewhere out there, beyond the horizon, she has a sister named Kay. Determined to find her, Cee devotes her days to building a boat from junk parts scavenged inland, doing everything in her power to survive until the day she gets off the island and reunites with her sister.