Mirror Dance (Vorkosigan Saga)

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.