The Darkening Glass (Mathilde of Westminster Trilogy, Book 3)

Mathilde of Westminster must face a dangerous foe in the third novel in Paul Doherty's acclaimed series.

March 1312 and England is divided. Edward II is in conflict with his barons over royal favourite Gaveston and Queen Isabella is momentously pregnant with the first union of Plantagenet and Capetian blood. Meanwhile rebel Robert Bruce prowls the Scottish border seeking advancement.
Mathilde of Westminster senses a challenge for the throne is imminent. When the great Earls step up their campaign the King and Queen are forced to flee to a fortified priory in Tynemouth now vulnerable to the Scottish marauders on land and Bruce's allies at sea.
With threats all around the royal party can only despair when one of their camp is murdered. Will Mathilde be able to find the perpetrator before the King loses control of the throne?