“Why is he so violently agitated?” said Finello, eagerly, to his friend.

“Hush!” returned the other. “You heard him say that when he saw the face behind the yellow mask, it was the face of his dead wife?”

“Yes. But what then?”

“His wife was buried in the Campo Santo.”

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CHAPTER V.

Of all the persons who had been present, in any capacity, at the Marquis Melani’s ball, the earliest riser on the morning after it was Nanina. The agitation produced by the strange events in which she had been concerned destroyed the very idea of sleep. Through the hours of darkness she could not even close her eyes; and, as soon as the new day broke, she rose to breathe the early morning air at her window, and to think in perfect tranquillity over all that had passed since she entered the Melani Palace to wait on the guests at the masquerade.

On reaching home the previous night, all her other sensations had been absorbed in a vague feeling of mingled dread and curiosity, produced by the sight of the weird figure in the yellow mask, which she had left standing alone with Fabio in the palace corridor. The morning light, however, suggested new thoughts. She now opened the note which the young nobleman had pressed into her hand, and read over and over again the hurried pencil lines scrawled on the paper. Could there be any harm, any forgetfulness of her own duty, in using the key inclosed in the note, and keeping her appointment in the Ascoli gardens at ten o’clock? Surely not—surely the last sentence he had written, “Believe in my truth and honor, Nanina, for I believe implicitly in yours,” was enough to satisfy her this time that she could not be doing wrong in listening for once to the pleading of her own heart. And besides, there in her lap lay the key of the wicket-gate. It was absolutely necessary to use that, if only for the purpose of giving it back safely into the hand of its owner.

As this last thought was passing through her mind, and plausibly overcoming any faint doubts and difficulties which she might still have left, she was startled by a sudden knocking at the street door; and, looking out of the window immediately, saw a man in livery standing in the street, anxiously peering up at the house to see if his knocking had aroused anybody.

“Does Marta Angrisani, the sick-nurse, live here?” inquired the man, as soon as Nanina showed herself at the window.