At that same instant they heard a footstep on the gravel, and sprang quickly apart. But just as they did so a tall, well-dressed, brown-bearded man came into view. Both held their breath, for no doubt he had seen her in Jack’s arms.

The man was the Marquis Giulio di San Rossore, a Roman nobleman, who was a friend of her husband the Prince. But that he was her secret enemy she well knew. Only a month ago he had fallen upon his knees before her, and declared his love to her. But she had spurned and scorned him in indignation. He heard her biting words in silence, and had turned away with an expression upon his face which plainly told her of the fierce Italian spirit of revenge within his heart.

But he came forward smiling and bowing with those airs and graces which the cultured son of the south generally assumes.

“They have sent me to try and find you, your Highness,” he said. “The Duchess of Spezia has suggested a ball in aid of the sufferers from the earthquake down in Calabria, and we want to beg of you to give it your patronage.”

And he glanced at the Princess’s companion with fierce jealousy. He had, as they feared, witnessed the beautiful woman standing with her head upon his shoulder.

“Let us go back, Mr Cross,” her Highness said, “I would like to hear details of what is proposed.”

And all three strolled along the fine old avenue, and skirted the marble terrace to where the guests, having now finished their tea, were still assembled gossiping with the Countess Von Wilberg and Countess Lahovary.

As they walked together, the Marquess Giulio chuckled to himself at the discovery he had made, and what a fine tale he would be able to tell that night at the Florence Club.

The truth was proved. The penniless Englishman was the Princess’s lover! Florence had suspected it, but now it should know it.

That same night, after dinner, Jack was standing alone with the Princess in the gorgeous salon with its gilt furniture and shaded electric lights. He looked smart and well-groomed, notwithstanding that his evening clothes showed just a trifle the worse for wear, while she was brilliant and beautiful in an evening-gown of palest eau-de-nil embroidered chiffon, a creation of one of the great houses of the Rue de la Paix. Upon her white neck she wore her historic pearls, royal heirlooms that were once the property of Catherine the Great, and in her corsage a splendid true-lover’s knot in diamonds, the ornament from which there usually depended the black ribbon and diamond star-cross decoration, which marked her as an Imperial Archduchess. The cross was absent that night, for her only visitor was the man at her side.