This is more than a story of how the world's most spectacular aerial predator invaded and took over New York City. It offers more than an expansion of our understanding of nature's most ubiquitous bird. It is the personal story of how a retired business manager, Saul Frank, hiked, biked, and climbed around New York City pursuing peregrines, often at great risk to himself, but always gaining enjoyment for himself and his wife. It is the story of how our greater understanding of the world's most successful predator came from an amateur bird watcher.