When a reenactment of the 1776 Revolutionary War's historic Battle of Bayport leaves the town's biggest benefactor dead, the Hardy boys can't help but throw their hats back into the detective ring.
While investigating the theft of several valuable Pennsylvania Dutch weather vanes, the Hardys uncover a startling twist in the case. The stolen weather vanes point directly to the nation's captial - and to a serious breach in national security!.