As witnesses were mysteriously murdered and the FBI, NSA, CIA and even the IRS were on the warpath in 1975, a senator named Frank Church stood almost alone in the face of extraordinary abuses of power. Drawing upon hundreds of interviews, thousands of pages of recently declassified documents, and reams of unpublished letters, notes, and memoirs, some of which remain sensitive today, Pulitzer Prize-winning reporter James Risen tells the gripping, untold story of truth and integrity standing against unchecked power - and winning.