Midnight Ride Without Paul Revere (Tilly’s Time Machine Book 2)

Grade school buddies Matt and Tilly risk another attempt at time travel and find themselves amid strangers who think they might be Revolutionary War spies. Yet just when the friends think they might be in real trouble, a teenage girl named Sybil Luddington chooses to believe their loyalties lie not with the King of England, but with American revolutionaries. And Sybil trusts them enough to take them on a special mission - a mission that proves kids can change history.