The President’s Shadow by Brad Meltzer

The President’s Shadow by Brad Meltzer.  It appears
presidentthat Ward Beecher has an ordinary job working with the National Archives but he has a much more important mission. He is a member of the Culper Ring, a secret society formed by George Washington. The current President needs the Culper Ring’s
help after a severed arm is discovered buried in the White House Rose Garden. The trail leads Beecher to one of  our
country’s greatest secrets.