THE ELDORADO NETWORK by Derek Robinson Norton; 409 pages; $12.50
Exam question: What does Spain produce? Well, brave bulls, rough red wine, the only true sherry, paellas, painters, poets, playwrights, flamenco dancers, gypsies, guitarists, terrorists, royalists, fascists. That answer rates 9.5 on the bromide scale. The most spectacular product of Spain, in fact, is and always has been the manic-romantic, the legion of brillants who have ranged from the old salt who convinced the Spanish that he had discovered a passage to India to the faded "conquistador" who tilted at windmills. Not quite in...