History is supposed to be dull. Who knew it could also be dangerous??

Kristen and Brad Everheart are taking part in a Revolutionary War battle re-enactment when they suddenly and inexplicably find themselves back in 1777. They have no way of knowing what’s going on; all they can do is try to get through the day. The siblings meet Rebecca Darrow, who is on her way to deliver a message of vital importance to General Washington. They also team up with Jacob Tyson, an ancestor of one of their modern-day friends, in order to escort Rebecca back to Philadelphia. Along the way, they deal with a spymaster, colonial deserters, and British soldiers who keep getting in the way.

And they still have to figure out how to get back to their own time....

http://www.barnesandnoble.com/w/timekeepers-j-y-harris/1109132986