I read this as a 14 year old, but even then I knew enough history to not take it seriously. A quick glance at the sensationalized cover should put most people on warning that a skeptical eye is necessary. Or perhaps the blurb here claiming that historical accounts claim Lincoln was killed by a lone, crazed gunman, and this book will give you the real dope is what will set off your warning bells. (A basic knowledge of the historical record reveals that there was a conspiracy trial, four people were hung, and several more imprisoned.) So from the get go, this book is aimed at history ignoramuses.
History does tell us that there was a conspiracy to behead the government, with assassins assigned to Vice President Johnson (got drunk and chickened out) and Secretary of State Seward (attempt made but Seward survived). What wasn’t certain was how far the conspiracy reached, with many believing that President of the Confederacy, Jefferson Davis, was behind it (never proved and doubtful at best). But this book implies that the person behind the conspiracy was Lincoln’s Secretary of War, Edwin Stanton! It suggests that he allowed John Wilkes Booth to escape Washington and covered up the fact that a Booth look-alike was killed instead of Booth, and that Booth lived on long after the event.
To give a context to the scholarly bona fides of this book’s author, two of his other books are In Search of Noah’s Ark and The Evidence For Heaven. In short, this book is ridiculous as history, but it is entertaining as sensationalist schlock.