The Wounded Hawk

According to the ancient pagan calendar of Europe, the Nameless Day is the one day of the year when the veil is thinnest between our world and the world of the spirits. In the Year of Our Lord 1377, the Black Plague is sweeping the continent, and Brother Thomas Neville has started seeing demons - or are they angels?
They tell him that the world is in more danger than ever before. Not only are the worlds touching, but minions of the Devil have crossed over and scattered throughout Europe, assuming human form. Their goal is to crash the very gates of Heaven.
It is Neville's task to seek out these demons and thwart their plan. He has made his way back across Europe to his home in England to seek the ancient book of knowledge that holds the secrets to defeat the demons. On his journey he has been forced to abandon his vows to the Church to further his cause, and has returned to his secular roots as a young nobleman.
In doing so, his life is caught up with his childhood friend Henry Bolingbroke, the fair young Prince Hal, newly crowned Richard II, who Neville suspects is in league with the Devil, and also with fair young Margaret, the enigmatic woman whom he takes to wife - not out of love, but as a means to discover if she is one of those who would destroy mankind.
It is Neville's task to discover the secrets of Heaven, but in doing so, what he discovers is that he can trust no one.
Least of all himself.