This volume contains two works:
“History and Evidence of the Passage of Abraham Lincoln from Harrisburg, Pa., to Washington, D. C, on the Twenty-second and Twenty-third of February, : Eighteen hundred and sixty-one” by Allan Pinkerton
“The Masked War” by William J. Burns
Each author has an important role in American history due to each of them founding a major detective agency with many accomplishments, some of which are recounted herein.