1936. Soldier of fortune Cal Jardine travels to Barcelona to help with the athletic games rivalling the Berlin Olympics. But as the first shots of civil war ring out, friendship, love and political conviction converge to persuade Jardine to once again embroil himself in a foreign war.

Discovering that the British athletes attending the games are keen to enlist for the fight, Jardine agrees to train them into a professional force. With old army comrade Vince Castellano and his beautiful interpreter Florencia Gardiola by his side, Jardine leads the athletes through the street battles of Barcelona and onto the fighting in the Catalan countryside but when murderous betrayal blights his previous fortune, Jardine will go to any lengths to seek suitable revenge...