War has started, South East England has been invaded, and Gwen and the Royal Sorcerers Corps are helping the army to fight off French magicians and drive the invaders back into the Channel. When an inexperienced major disobeys orders, sending two hundred hussars to their deaths, Gwen compels him to sit down and shut up but, in doing so, permanently damages his mind. After the battle, Lord Mycroft suggests that she needs to be less prominent until rumours of what she did to the major have been dispelled. He assigns her a mission to go to New York - the colonies are also under attack from the French and all but one of the sorcerers stationed in America have been poisoned by a rebel slave. The few locals with any known magical talent are untrained and certainly not ready for combat. Gwen must train them quickly. She sets off on HMS Duke of India, along with Irene Adler and Irene's new apprentice, Raechel Slater-Standish, accompanying a naval squadron and a regiment being sent to reinforce colonial defences. But even before they reach New York they meet armed opposition.In 'Sons of Liberty', Gwen is sent from the relative safety of London to the colonies, where an undercurrent of revolution still abounds and intrigue and espionage are essential to keep the enemy at bay. But who exactly is the enemy? In the latest book in this exciting alternate history series, Christopher Nuttall expands Gwen's horizons beyond Europe into the New World.