At last the litter of Theodora was set down by its swarthy bearers before the threshold of Sidonia's house. Theodora alighted and, after commanding the Africans to await her return, ascended the narrow stone steps alone and knocked at the door. After a brief wait, shuffling steps were heard from within, and a bent, lynx-eyed individual of Oriental origin opened the door, inviting the visitor to enter. She was ushered into a dusky hallway, in which brooded strange odors, thence into a dimly lighted room, the laboratory of Sidonia. Hardly had she seated herself when the woman entered and stood face to face with Theodora. The eyes of the two women instantly met in a searching glance that took in the whole ensemble, bearing, dress and almost the very thoughts of each other. In that one glance each knew and understood; each knew that she could trust the other, in evil, if not in good. And there was trust between them. The evil spirits that possessed their hearts clasped hands, and a silent league was formed in their souls ere a word had been spoken. Sidonia wore a long, purple robe, totally unadorned. The sleeves were wide, and revealed her white, bare arms. Her finely cut features were crossed with thin lines of cruelty and cunning. No mercy was in her eyes, still less on her lips, and none in her heart, cold to every human feeling. "The Lady Theodora is fair to look upon," Sidonia broke the silence. "All women admit it; all men confess it." And her gaze swept the other woman, who was clad in an ample black mantle which ended in a hood. "Can you guess why I am here?" Theodora replied. "You are wise and know a woman's desire better than she dares avow." "Can I guess?" replied Sidonia, returning Theodora's scrutiny. "You have many lovers, Lady Theodora, but there is one who does not return your passion. And, you have a rival. A woman, more potent than yourself, has, notwithstanding your beauty, entangled the man you love, and you are here to win him back and to triumph over your rival. Is it not so, Lady Theodora?" "More than that," replied the other, clenching her white hands and gazing into the eyes that met her own with a look of merciless triumph at what she saw reflected therein. "It is all that--and more--" Sidonia met her eager gaze. "You would kill your rival!" she said with a smile upon her lips. "There is death in your eyes--in your voice--in your heart! You would kill the woman. It is good in the eyes of a woman to kill her rival--and women like you are rare!" "Your reward shall be great," Theodora said with an inquisitive glance at the woman who had read her inmost thoughts. "To kill woman or man were a pleasure even without the profit," replied Sidonia, darkly. "I come from a race, ancient and terrible as the Cæsars, and I hate the puny rabble. I have my own joy in making my hand felt in a world I hate and which hates me!" She held out her hands, as if the ends of her fingers were trickling poison.