The narrative begins in the sun-drenched gardens of the French Riviera, where Ralph Moray, a young journalist, devises a daring scheme to rescue his friend Lord Terence Barrymore from financial ruin. Disguised as an amateur chauffeur driving his own Panhard car, Terence is hired by Mrs. Kathryn Kidder, a wealthy American widow who has recently purchased an Austrian title and now styles herself the Countess Dalmar. Accompanied by her young daughter Beatrice, known as Beechy, and her orphaned niece Maida Destrey, the party sets out on a grand tour across Europe. Right from the start, their journey is dogged by complications, most notably in the form of Prince Dalmar-Kalm, an aristocratic fortune hunter who pursues the party with his magnificent red car, determined to win the Countess and her fortune.
The journey evolves into a grand adventure as the travellers navigate the steep, treacherous mountain passes of the Roya Valley, battling mountain storms, greasy mud, and mechanical mishaps. They cross borders from France into Italy, encountering quaint local customs, bustling markets, and picturesque medieval towns like Tenda and Cuneo. Throughout the trip, the dynamic between the travellers shifts. Terence proves his mettle not only as a skilled driver who can master any road condition, but also as a man of quiet nobility. Meanwhile, the sparkling wit of young Beechy provides constant amusement, while the gentle, bookish Maida begins to thaw, revealing a deep appreciation for history and poetry that draws Terence closer to her, despite the social gulf that separates them.
The plot thickens as Prince Dalmar-Kalm resorts to various schemes to discredit Terence and win the Countess's favor. His car repeatedly breaks down, forcing the resilient Panhard to tow the massive red giant through narrow gorges and over steep alpine summits. These shared trials forge a bond among the travellers, testing their courage and revealing their true characters. The Countess, despite her initial superficiality, displays a loyal and surprisingly game spirit, refusing to abandon her hired companions even when tempted by the Prince's glittering offers.
As the journey presses onward toward Milan, Pavia, and the shimmering lakes of northern Italy, the romantic tension between Terence and Maida heightens. Maida is facing a bleak future dictated by her father's will, which threatens to drive her into the solemn seclusion of a religious sisterhood. Terence, bound by his role as a humble chauffeur and his fear of being labeled a fortune hunter, struggles to suppress his growing affection. Yet every mile brings them closer to a reckoning where social pretenses must fall away.
The narrative gently hints at a resolution where true worth triumphs over mere titles and wealth. Through narrow escapes, starlit monastery nights, and the sheer exhilaration of the open road, the characters are transformed. The journey ultimately proves that the most valuable discoveries are not the palaces and landscapes they pass, but the unexpected truths they find within themselves and each other.
