Police try to hunt down a serial killer in 1912 Buenos Aires.
Buenos Aires, Argentina. 1912. A series of brutal child murders is extending throughout the city.
Mateo (Juan Ciancio), a 10 year-old boy, is hiding a secret: sometimes his mind takes him to dark places inside his memories, where he becomes the witness to the murders. When Mateo's secret is unveiled, he turns into the main murder suspect.
With help from the police and Dr. Soria, his mother Stella (Maribel Verdú) tries to find a rational explanation for these visions and hopefully counteract the persistent skepticism of Inspector Petrie.
Yet the murders continues and absolute chaos ends up taking over the situation.
