This crystalline gem of a book considers the improbable survival of a small, obscure, and critically endangered aquatic animal, the Devils Hole pupfish, that has the most restricted habitat of any known vertebrate species. Deeply researched, engagingly presented, and convincingly argued, this is a remarkable story, one that is important and exceptionally well told." - Mark V. Barrow Jr, professor of history, Virginia Tech and author of Nature’s Ghost: Confronting Extinction from the Age of Jefferson to the Age of Ecology