Duran and his team of the fifth group are secret agents missioned by Inspector Peña to find and capture a gang of dangerous criminals who are planning a major hit.

Ignacio, a professional footballer, has sentimental and labor problems. His girlfriend is about to abandon him because of the constant displays of affection that the player receives from an attractive admirer. At the same time, Ignacio discovers that two of his teammates have been bribed by another team.

A young policemen witnesses a bank robbery which will become his first case. To catch the thieves he will infiltrate himself as one of the gang members. At first it works, but it won't be so easy afterwards.