In short, energetic chapters, Meltzer and Mensch, who collaborated on The First Conspiracy: The Secret Plot To Kill George Washington (2019), fashion a brisk political thriller centered on a nefarious plot to murder Lincoln before his inauguration. Lincoln, who won a slim majority of the popular vote, was deeply hated by the slaveholding South. Six weeks after the election, South Carolina became the first state to secede; five others soon followed, and Jefferson Davis was sworn in as president of the Confederacy. But secession did not satisfy a group of conspirators who gathered to devise a plan to seize the city of Washington and prevent the inauguration and even to kill Lincoln on his way to the capital, “and thus inaugurate a revolution.” The authors speculate that the conspirators were likely members of the Knights of the Golden Circle and National Volunteers, groups composed of pro-slavery white supremacists that grew in virulence after Lincoln’s election and likely were precursors of the Ku Klux Klan. They were thwarted largely through the efforts of pioneering private detective Allen Pinkerton, who was called in to investigate, and foil, the plot. The authors create an admiring portrait of Pinkerton and his staff, which included the first female detective, the sly, unflappable Kate Warne. In addition, a secret “Committee of Five,” convened by Secretary of State William Seward, gathered in Washington to ensure the peaceful transfer of power. Pinkerton was charged with logistics, which meant studying the train route for Lincoln’s convoluted inaugural journey, planning for every contingency, and eventually masterminding a plan that involved smuggling Lincoln, in disguise, onto a train days before he was expected. In addition to revealing the conspiracy, the authors vividly convey the virulent racism endemic in the South.