Spies at Mount Vernon: The Virginia Mysteries Book 7

Dead drops, cyphers, and invisible ink are all part of a mystery that even spymaster George Washington would love.

Sam, Derek, and Caitlin love solving mysteries, and when they visit Washington, DC, spies are lurking. What starts out as a fun game of pretend on the National Mall turns all too real when they follow a mysterious man to a meeting deep within the Capitol.

To keep government secrets from falling into the wrong hands, the kids must work with federal agents and travel to historic Mo...