In 1967, Howard Donahue, an expert in guns and ballistics, began investigating the assassination of President John F. Kennedy. His research led him to a shocking conclusion: Lee Harvey Oswald could not have fired the shot that shattered Kennedy's skull, and, in Donahue's judegment, only one other person could have. He was convinced he knew who pulled the trigger, and why this savage irony had remained buried for so long. He also reconstructed where the bullet came from and how it was fired. In this book, award-winning journalist Bonar Menninger chronicles Donahue's 25-year investigation of President Kennedy's death and the revelation it led him to.