Following the devastating loss at the battle of Brandywine, three young patriots anonymously assist the American retreat by helping to prevent pursuit by the British, and also aid the wounded General Lafayette, who has been separated from his troops. During the battle, the British had captured 18 guns of the line, effectively crippling the American forces, but with Lafayette's help, the rebels devise a plan to retrieve the cannon and return them to the rebel troops.

Irritated with the daily ringing of the Liberty Bell in Philadelphia as a show of defiance against the English occupation, the British decide to remove the bell and melt it down. Receiving word of this, the young rebels devise a plan to intercept the bell and take it into hiding.

Jeremy is sent to Philadelphia on an emergency mission to intercept a spy and the document he's carrying before he can be betrayed by a double agent. Unknown to Jeremy, however, the spy he is assigned to protect is the double agent.