For the past ten years, the city of Khonsu, built on the foreign planet Reiddo, sent a daily transmission home to Earth. Then one day, the transmissions stopped coming. Rebecca Vance fears that something disastrous has happened to Khonsu. She and her friend Mark Wu, the nearest thing there is to an expert on Reiddo, convince the leadership at the AAIR (the American Agency for Interplanetary Relations) to investigate the city's strange disappearance, eventually making their way to the site of the lost city itself. From the beginning, the expedition is plagued by problems. The city isn't where it's supposed to be. There are mysterious deaths among the team members. Rebecca has never trusted easily, but she must put aside her fears and doubts in a frantic attempt to find survivors before they are lost forever. The natives are friendly and seem anxious to help, but they aren't alone. A deadly secret puts her own life at risk and possibly the lives of the members of her team. It may even spell doom for the entire planet she calls home.