From amazon.com:
Mark's quixotic attempt to "liberate" children being held in Jackson's Hole ends in disaster, compounded by Miles' "death" in the rescue operation. Miles is being revived in a cryo-chamber, but the chamber disappears. Mark's attempt to find his brother and redeem himself leads to his own terrifying incarceration; and the struggles of Miles, Mark and Cordelia take on fairly superhuman proportions in this Hugo-Award winning novel.