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Marooned On A Doomed World! Four months passed without a word from the Sentinels, and the members of the Expeditionary Mission to Tirol were beginning to fear the worst. This, even as they entered into truce negotiations with the being who might have been responsible for the destruction of the Sentinels' starship -- the Invid Regent himself. Meanwhile, the survivors of the Farrago remained hopelessly stranded on Praxis, a planet in cataclysm, hastened to endtime by the dark designs of the Invid Regis. But deep within that world's transformed core were answers to the Sentinels' prayers; if they could only reach them before Praxis tore itself apart. For Rick and Lisa Hunter, Cabell, and the others, the moment had arrived for desperate actions... And Time Was Running Out!