The Golden Spaniard — Dennis Wheatley

Spain is writhing in the torment of Civil War. In a Madrid bank lays ten tons of gold: and both sides want it. The lovely Countess Lucretia Coralles, known to the rebels as 'The Golden Spaniard', leads the double life of a secret agent. And she has other secrets too…

The Duke de Richleau's mission is to retrieve the gold, hidden somewhere in the war torn country, before the communists. In calling on his usual companions for support he finds that their sympathies lie with his enemy, and very soon the formally indomitable trio are trying to outwit one another in a potentially lethal treasure hunt.