The narrative begins in Biarritz, where Christopher Trevenna—actually the banished Marqués de Casa Triana—falls instantly in love with Lady Monica Vale, a companion to the future Queen of Spain. Bound by family enmity and royal politics, Monica is targeted by the wealthy and dangerous Duke of Carmona, who seeks both her hand and court favour. Defying the odds, Christopher and his loyal American friend Dick Waring, accompanied by a delightfully eccentric military father and his spirited daughter, chase Carmona's party across the rugged landscapes of northern and central Spain in an automobile.
The journey takes the travellers through historical heartlands, from the majestic gorges of Pancorbo to the wild spaces of Castile, passing through Burgos, Valladolid, and Madrid. Christopher navigates narrow escapes from the police, secret nocturnal guitar serenades, and dramatic confrontations inside the brooding gloom of the Escurial. Carmona attempts to trap and eliminate his rival using old servants and bureaucratic obstacles, but the genuine loyalties of friends and local Spaniards consistently foil his plots.
As the party edges closer to Seville in time for the famous ceremonies of Holy Week, the tension between the two suitors reaches a breaking point. The narrative contrasts the ancient, unyielding traditions of Spanish aristocracy with the modern thrill of early motoring. Throughout the trials, the bond between Christopher and Monica deepens despite her mother's stern opposition and the Duke's calculated machinations. The journey transforms from a desperate chase into an awakening of the soul across a landscape rich in history and colour.
The tale moves toward a dramatic resolution in the sun-drenched south, where the ancient feuds of Spain clash with the spontaneous impulses of youth and true affection. The lovers' persistence is tested against formidable social barriers, leaving the reader with the distinct sense that passion and heritage will ultimately determine their fate.
