Beto works at a gym as a night security guard. He has no family. He is a lonely man and the secret he keeps isolates him even more: he suffers from a mysterious disease that is turning him into some kind of zombie. He struggles, but he cannot hide it, so he decides to quit his job. However, before doing so, he unveils his condition to the manager of the gym, Luly, and a very unusual friendship arises between them. Sebastián Hofmann's debut is not a horror film itself, nor is it a film about zombies. Halley is a drama that explores loneliness and body decay.