She searched the quinta, of course, whenever she had a chance, but she discovered nothing--with the result that the mystery began to engross her whole thought. She pried into the obscurest corners, she questioned the slaves, she lay awake at night listening to Esteban's breathing, in the hope of surprising his secret from his dreams. Naturally such a life was trying to the husband, but as his wife's obsession grew his determination to foil her only strengthened. Outwardly, of course, the pair maintained a show of harmony, for they were proud and they occupied a position of some consequence in the community. But their private relations went from bad to worse. At length a time came when they lived in frank enmity; when Isabel never spoke to Esteban except in reproach or anger, and when Esteban unlocked his lips only to taunt his wife with the fact that she had been thwarted despite her cunning. In most quarters, as time went on, the story of the Varona treasure was forgotten, or at least put down as legendary. Only Isabel, who, in spite of her husband's secretiveness, learned much, and Pancho Cueto, who kept his own account of the annual income from the business, held the matter in serious remembrance. The overseer was a patient man; he watched with interest the growing discord at the quinta and planned to profit by it, should occasion offer. It was only natural under such conditions that Dona Isabel should learn to dislike her stepchildren--Esteban had told her frankly that they would inherit whatever fortune he possessed. The thought that, after all, she might never share in the treasure for which she had sacrificed her youth and beauty was like to drive the woman mad, and, as may be imagined, she found ways to vent her spite upon the twins. She widened her hatred so as to include old Sebastian and his daughter, and even went so far as to persecute Evangelina's sweetheart, a slave named Asensio. It had not taken Dona Isabel long to guess the reason of Sebastian's many privileges, and one of her first efforts had been to win the old man's confidence. It was in vain, however, that she flattered and cajoled, or stormed and threatened; Sebastian withstood her as a towering ceiba withstands the summer heat and the winter hurricane. His firmness made her vindictive, and so in time she laid a scheme to estrange him from his master. Dona Isabel was crafty. She began to complain about Evangelina, but it was only after many months that she ventured to suggest to her husband that he sell the girl. Esteban, of course, refused point-blank; he was too fond of Sebastian's daughter, he declared, to think of such a thing. "So, that is it," sneered Dona Isabel. "Well, she is young and shapely and handsome, as wenches go. I rather suspected you were fond of her--"