By 10:15 that evening, the comedy was well into its last act. In the Presidential Box, President and Mrs. Lincoln and their guests, Major Henry Rathbone and his fiancée, Clara Harris, laughed at the show along with the audience—not knowing that Booth was just outside the door.

How could such a thing have taken place—and in Washington, the fortified capital of the nation? How did Booth gain such access to the theatre?

Why didn’t Lincoln’s security people stop him?

Was it a lone act or part of a larger conspiracy?

And, when all was said and done, what was the outcome—for those involved in the crime, for their victims, for the nation and even for Ford’s Theatre?

Conduct your own investigation below! As you look at the evidence, consider: