Desc: Km 31-2: Directed by Rigoberto Castañeda. With Carlos Aragón, Mauricio García Lozano, Adrià Collado, Verónica Merchant. The police officer Martin Ugalde is called to investigate a series of kidnappings in Mexico City of kids between 6 and 9 years old. Immediately, he realizes these abductions have a special link with the case seven years before.