The author of this book, General Thomas Maley Harris, was a medical doctor, who recruited and served as commander of the Tenth West Virginia Volunteers during the Civil War. He rose in rank through meritorious service to become a brigadier general in the Union Army. General Harris established a reputation for faithfulness, industriousness, intelligence, and efficiency. He was noted for his leadership in preparing his troops and leading them in battle. He was brevetted a major general for "gallant conduct in the assault on Petersburg." After the Civil War, General Harris served one term as a representative in the West Virginia legislature, and was West Virginia's Adjutant General from 1869 to 1870. General Harris was a member of the Military Commission that tried and convicted the conspirators who assassinated President Abraham Lincoln. He had first hand knowledge of the sworn testimony of the witnesses in that trial. This book summarizes the salient evidence brought out during the military trial and adds information from other sources to present before the public the ineluctable conclusion that the assassination of Abraham Lincoln was the work of the Roman Catholic Church. The Roman Catholic Church has been largely successful in suppressing the circulation of this book. This book has never been given a place on bookstore shelves, as it exposed too much for the Roman Catholic hierarchy to tolerate. Any display of this book would bring an instant boycott of the bookstore. It is only now, in the age of the internet, where the marketplace of ideas has been opened wide, that this book can be found by those searching for the truth of who was behind the assassination of Abraham Lincoln.