Joaquín Densalat

A Spanish police chief hires an undercover agent, Eagle, to infiltrate a gang of heroin smugglers. Infiltrating the gang, he uses a female agent as a point of contact. However he discovers that there bigger goings-on than dope. The gang is involved in the transportation of smuggled uranium for the manufacture of nuclear arms for sale to Libya and other aspiring third world countries.

The adventures of four boys, two girls, and a monkey, facing off against a gang of youths from different social backgrounds, two police officers, and other secondary characters, create a mosaic of adventurous life with a surprising ending.