There are 3 books in the The Culper Ring series. The newest book is The President's Shadow which came out in 2015.

1
The Inner Circle

Book cover of The Inner Circle

The darkest secret of the U.S. Presidency is about to be revealed.

Beecher White, a young archivist for the US government, has always been the keeper of other people's stories, never a part of the story himself . . . Until now.

While Beecher is showing Clementine Kaye, his first…

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2
The Fifth Assassin

Book cover of The Fifth Assassin
From John Wilkes Booth to Lee Harvey Oswald, there have been more than two dozen assassination attempts on the President of the United States.
Four have been successful.
But now, Beecher White--the hero of the #1 New York Times bestseller The Inner Circle--discovers a killer in Washington, D.C., who's meticulously…

3
The President's Shadow

Book cover of The President's Shadow

The number one New York Times bestselling author of THE INNER CIRCLE delivers the third novel in the blockbuster Culper Ring Trilogy.

Beecher White, a humble archivist at the U.S. National Archives by day, has a secret: he belongs to the Culper Ring, a network of spies founded by George…