Three old schoolmates, who in their time as students had formed a kind of secret society called The Black Hand, in order to embitter teachers' lives, meet again years later with very different lives. One is a dad's son who is distracted as best he can; another has become a writer of espionage novels and is persecuted by the CIA, and the third leads an indolent life without further ado. The reunion of the three friends will make the society of La Mano Negra revive.

Manolo, un hombre sin trabajo que vive con sus padres, se reencuentra con su viejo amigo Mariano, escritor de una novela policiaca de gran éxito en Estados Unidos. Pero Manolo sospecha que puede tratarse de una historia autobiográfica y empieza a investigar.