When counterfeit prescription medicine started turning up in the nation's supply and threatening some of the sickest and weakest patients, Katherine Eban went in search of the story. What she found was an unlikely and irresistible group of heroes-five aging South Florida investigators who dubbed themselves the Horsemen of the Apocalypse and held their meetings at Hooters. Working around the clock on cases no one else wanted to tackle, they followed the trail of stolen and contaminated medicine in a takedown eventually dubbed Operation Stone Cold. This riveting page-turner takes us along with the Horsemen as they wade into "more rank Florida unseemliness than a Carl Hiaasen novel" (Salon) to ultimately uncover $33 million in bad medicine and make more than sixty arrests. Thanks in part to the attention Dangerous Doses received in hardcover, the media, politicians, and drug companies are starting to address the problems it uncovered. This new paperback edition includes a chapter with the latest update on these developments.