In order to put an end to the numerous ambushes on the gold transports which are a real menace to the finances of the American government, the agent Joe Ford, called Dynamite Joe due to his liking for explosives, is entrusted with controlling the next transfer.

Summer 1985. As every year, Rodri travels from Catalonia to Galicia and is reunited with his four friends. As real-world problems begin to undermine their friendship, the five of them embark on a nighttime adventure in search of a mythical object.