A young woman guards the main exhibit of her family's London museum: The Emerald Coat, a garment which kills whomever dons it by permanently transporting them to another realm. The woman lives as a gatekeeper to death, wondering when she will fulfill what she believes to be her ultimate fate — putting the coat on herself, and leaving this world forever.

When a far-away planet requests the return of two fugitive queer extraterrestrials, a closeted man finds the empathy necessary to enable their escape.