The Eye that Never Sleeps: How Detective Pinkerton Saved President Lincoln

This picture-book biography traces Allan Pinkerton’s path from founding the first U.S. detective agency to investigating a plot against Abraham Lincoln. It explains aspects of the Pinkerton Method, including undercover work, then focuses on the 1860 investigation in Baltimore. Pinkerton and his staff, which included women detectives, uncover the secessionists’ assassination plan and prevent it with Lincoln’s cooperation shortly after his election as president.