In The Shade Of The Old Oak Tree

Mogul finds what appears to be a single large oilfield beneath the Bay of Biscay, straddling French and Spanish waters. On the road to San Sebastián, James Langley and Peter Thornton are ambushed, and Langley is taken to a hideout in the Pyrenees by Basque nationalists, who will free him only if Mogul recognises Basque claims to the oil and negotiates with the exiled Basque government.