Answer
The mastermind behind the kidnapping scheme was John Wilkes Booth, a well-known actor and Confederate sympathizer. Booth's plan involved abducting President Lincoln and holding him for ransom, with the ultimate goal of pressuring the Union into releasing Confederate prisoners. Booth, along with other conspirators, recruited Lewis Powell, a former Confederate soldier, to participate in the plot and assigned him the task of capturing Secretary of State William H. Seward.