"It's been 925 summers since the Jemen introduced zyme, a bioluminescent algae, into the world's ocean and unwittingly triggered an Ice Age that has consumed most of the planet. All but a handful of Jemen flew to the stars, but before they left, they recreated several extinct species that had thrived in the last Ice Age. After almost a thousand summers, the archaic hominins that struggle along the edges of massive glaciers are dwindling. All they have to save them is a dying quantum computer called Quancee and her student, a Denisovan man named Lynx. When the last Jemen, Vice Admiral Jorgenson, tells Lynx he's going to dismantle Quancee and use her parts to create a new computer, Lynx is stunned. He can't let Jorgenson kill Quancee! Meanwhile, in the lodges of the Sealion People, a sick boy on the verge of manhood hears voices. One is an old woman who sings to him. When Jawbone goes on his first quest to find a spirit helper, the old woman finds him"--