On Halloween night, a woman finds herself without a costume, and with a malevolent visitor at her door.

In this sci-fi retelling of Edgar Allan Poe's "The Tell-Tale Heart", a pair of astronauts work on a small ship orbiting a distant planet. As the mysterious narrator attempts to convince himself of his sanity while describing his brutal act of murder, he becomes haunted by a thunderous heartbeat that could only come from the far reaches of space.