After a family tragedy, three generations of the Deetz family return home to Winter River. Still haunted by Betelgeuse, Lydia's life is turned upside down when her teenage daughter, Astrid, accidentally opens the portal to the Afterlife.

A 10-year-old boy yearning to become a mermaid meets a struggling drag queen consumed by grief. Their unexpected bond grows so strong they'll put everything on the line to preserve it.