The Circus Fire: A True Story - Stewart O'Nan (2000)

Stewart O'Nan is almost an author I adore, but he defies clear categorization as he writes beautifully in a number of genres.  This is the first book I read by him, and it sparked a abiding interest in well-written disaster books.  In 1944, a massive fire broke out at a circus in Hartford. Simply written and incredibly evocative, this book is a fascinating portrait of wartime America as well as of humanity and how we respond to disastrous events.