The battle with the Dread Viscount rages on—but so does the siege of Breda! When Issak comes into possession of a new cannon meant to relieve the siege, he knows he must not let it fall into enemy hands, but he and his friends can’t protect the gun. Instead, he comes up with an audacious plan so that the weapon can serve its purpose…whether it’s in one piece or not! As the battle ebbs and flows, it becomes clear that the Viscount will hold the upper hand so long as he has the fortress of Heusden at his back. Heinrich leads a daring raid to steal the stronghold right out from under him. The strike appears to succeed—but what if the Viscount now has the heroes right where he wants them?!