Book excerpt: A war on two fronts. A deadly threat from within. The new gripping medieval historical thriller from expert historians and authors A.J. Mackenzie 1346: Sent back to England in the wake of the tremendous victory at Crécy, Simon Merrivale is at once caught up in a new emergency as a powerful Scottish army sweeps into northern England. Joining up with the Archbishop of York, Lord Percy and their army mustering in the north, Merrivale discovers a new hotbed of treason, as merchants, landowners and soldiers on both sides of the border play off one side against the other. Uncovering foreign agents in the English camp, he realises the gravity of what is about to unfold. As the Scottish army continues its relentless march, Simon will have to use all his wit and guile to uncover a spy operation so powerful that no throne in Europe is safe... Perfect for fans of Bernard Cornwell, S.J. Parris and Matthew Harffy, this is an exceptional historical espionage thriller, as rich in detail and research as it is in intrigue, suspense and action.