 Why did Opal let Rog go back to Earth?
Within the dome of the barrier, it looked more like a well-kept if bizarre little country estate. They entered the house, which had no roof, continued to move beneath a sky that glowed with light which did not come from a sun or moon. Eudalia had been a female foreman in a garment-cutting shop before being captured and brought through. It arrived before the meal, materializing against one of the seven walls of the roofless chamber. Dana stood almost in the center of the room, carmine-tipped fingers clasped beneath the swell of her breasts. This was so with all of their foods, with their cigarettes, with everything in their prison—or their cage.
 because the aliens weren't good at capturing other men
 so he would fall out of love with his wife  so he could try to escape and fail  because the aliens weren't good at capturing other men  as a reward for his hard work