"Absoliutno blagopoluchnoe ozero Baikal!" the Russian scientist looking out over the great lake says. "Lake Baikal is Perfect!" And humans can never harm it.For a man cut loose from his life in the U.S., Lake Baikal-Siberia's sacred inland sea-becomes a place of pilgrimage, the focal point of a 25,000-mile journey by land and sea in search of connection, permanence, restoration and hope. Following a difficult divorce, veteran environmental journalist Peter Thomson sets off from Boston with his younger brother for one of nature's most remarkable creations, in one of the farthest corners of the planet. Lake Baikal, a gargantuan crack in the Siberian plateau, is the world's largest body of fresh water, its deepest and oldest lake, and a cauldron of evolution, home to hundreds of unique creatures, including the world's only freshwater seal.