Then, as she was about to give up, support reached her. Revere was sending to her, helping her to steady herself. She could sense his complete exhaustion, felt concern for him even while she accepted gratefully his mental powers of assistance. Only such a relationship as theirs, she realised, could cope with the blanketing torment of the invaders. He was telling her something, that Rolf and the others had compiled some sort of error that afternoon from the vision-grid. The thought ran, _They think they know what the creatures are now but they don't. Even I don't. My images were mixed. They are not the dominant near-human species we thought but something else...._ Slowly his thoughts faded once more, unable to hold out against the fatigue that was plaguing him. But his hopeless message of defeat had sprung a fresh thought-train in Lynne's mind, one that so occupied her attention she was able to hold the invaders at bay almost without effort. She recalled the murals--the near-human looking dominants and their pets with the disgusting dual bodies and vile games and many-faceted eyes. She thought back to what Revere had just said via thought-waves--_They are not the dominant near-human species we thought but something else...._ She saw once more, in clear memory-vision, the telepathic picture that had come to her of Rolf and Revere and the visual-grid. No wonder the pictures had looked foggy and full of "ghosts." In his mind's eye, limited by the fixed belief of Mars that only the dominant species could have survived in invisible form, Revere had tried to project these near-humans onto the screen. Inwardly, subconsciously, he had known better. The dominant species had _not_ survived--on Mars at any rate. It was the horrid little creatures with the multi-faceted eyes and the capuchin-like heads and the dual bodies that had managed to shed their corporate existence and still maintain life of a sort. The masters had gone--the beasts remained.... Lynne felt a wave of delight at her discovery, realised it was more a result of her not having been inhibited by the traditions of Martian conditioning than through any genius of her own. For an instant she let down the bars of her mind--and the invaders, hovering unseen about her in the tower-room, came swarming in for their third and fiercest attack. They knew she had guessed their nature, were determined to prevent Lynne from making the discovery clear to other humans. For they too were telepathic. VIII This time they actually knocked Lynne to the floor of the tower-room. It was greater torment than she had ever endured in her life. Somehow she could sense the pattern behind its intensity, even while she was in the grip of a mental confusion that seemed to be burning out the very fibers of her brain.