Barcelona, 1950. A man is killed in front of a Police station. The case is given to two agents, a skilled veteran and an eager young one, who team to solve it while bit by bit their efforts unveil the truth. We follow them in their progress with ups and downs, to a thrilling climax in a local amusement park. Filmed on location, so many views of Barcelona at the time.

Locations: Ronda and Plaza de la Universidad, Frontón and Atracciones Apolo, facade and interior of La Vanguardia, facade and interior of Correos, old plaza de Antonio López, Les Rambles, Via Laietana and Copérnic and Aribau street.