Whether he's tracking down a chameleon con artist in Europe, reporting on the infiltration of the Aryan Brotherhood into the U.S. prison system, or riding in a cyclone-tossed skiff with a scientist hunting the elusive giant squid, the author of The Lost City of Z revels in telling stories that explore the nature of obsession. In the 12 true stories here, David Grann introduces the world's foremost expert on Sherlock Holmes, found dead in mysterious circumstances; an arson sleuth trying to prove that a man about to be executed is innocent; sandhogs racing to complete New York City's water tunnels before the old system collapses; and most compellingly, an amnesiac 9/11 first responder who doesn't recall if he was brave or cowardly.