La espada del diablo

William of Yorkshire is a Knight Templar with an extraordinary capacity for deduction. Jacques de Autier has been educated within the Cathar creed and, through his gaze, the reader will witness the fall of Montsegur and will have access to the secrets that were hidden in the impregnable Occitan fortress. The lives of both will be intertwined when William tries to solve the murders of several abbots of the seven monasteries built on the cut that the sword of the archangel Saint Michael struck the earth during his confrontation with the devil.