Nights in a row, Adrian finds himself in his apartment, with no lights and strange sounds coming from the inside. He asks his friends for help and one of them decides to make a documentary of what is happening to him.

Adrian and Esteban have been missing for a year, with only their belongings found in Cozumel near the Riviera Maya. The police are at a standstill, but their friend Alex starts his own investigation using their cellphones...and discovers that the truth is more terrifying than he could ever imagine.