Guy d'Alville had been a Knight of the Hospital before he was expelled from the prestigious military order. His fortunes had waned dramatically since then. All because of one man, a Templar knight from Ireland named Robert FitzWilliam. So Guy determined this man would pay with his life. Upon arrival in Ireland he discovers ancient forces at work. Recognising a shadowed soul when She sees one, the Queen of the Night offers Guy an opportunity to regain rank and title in the world. But in the first days of his conquest, Guy unwittingly unleashes the frightening fury of the Nathairai, whom some call the Watchers. And this is just the start of all the trouble that will beset the luckless Guy ...

Guy d'Alville has already faced the terrible Nathairai - and tasted humiliating defeat. But all is not lost. He has taken possession of the sacred books of the holy community of Killibegs. These heretical works are much sought after by the officers of the Holy Inquisition. D'Alville resolves to take the manuscripts to Rome in the hope of restoring his reputation, title and lands. But in making his escape from the Killibegs, Guy commits a serious blunder. In his haste to leave the heretics, he passes through a doorway to the Otherworld, finding himself trudging through the strange landscape of myth, spirits and mischief beyond the magical barrier separating the two worlds. Pursued by the elders of the Killibegs, led by Robert FitzWilliam, Guy is faced with a remarkable opportunity as his life takes an unexpected turn. He discovers a friend in the most unlikely of men. And all of this comes to pass the very moment he takes a sip of the waters of the Well of the Goddess.

Robert Fitzwilliam and his fellow adventurers have each, in their own way, found what they were seeking in the mystical Otherworld. But their intrusion into that sacred country has stirred the wrath of Aoife, Queen of the Night. With her legions of Redcap warriors, she is planning to march on the realm of mortals with one aim: the wholesale destruction of Ireland and the enslavement of all mortal-kind. The people of Killibegs band together to face their fearsome foes in a last desperate stand. They have one chance to defeat the Redcaps: a flimsy, untried strategy that will pit the faith, courage and strength of the heretics against the cold vengeance of the dark ones of the Otherworld. Friendships are forged in this struggle; warriors are put to the test and alliances strained to the point of collapse. But in the end, no matter what happens, it will be those who drink from the Well of Many Blessings who will triumph.