With the entire village of Carter disgruntled at the influx of virus survivors from Old Earth, Hal feels increasing pressure to get away for a while. He sets off with a few friends to find Chase and bring back Bo and Astrid Hammacher, the missing shapeshifter twins, who should have turned into sphinxes long ago and instead vanished without a trace. But Hal has another reason to get away, for werewolf blood courses through his veins...