It was a book about John Scobal, who posed as a cook or slave and gathered information for the Union Army, written by Alan Pinkerton.
Allen ends up writing a book about John Scobal the spy of the rebellion which is still it's on the CIA's website today also Scobal probably didn't exist there's no records of them
— Episode: 624 - The Pinkerton Agency - Part One
Episode: 624 - The Pinkerton Agency - Part One
It was a book about John Scobal, who posed as a cook or slave and gathered information for the Union Army, written by Alan Pinkerton.
Allen ends up writing a book about John Scobal the spy of the rebellion which is still it's on the CIA's website today also Scobal probably didn't exist there's no records of them