The Lucifer Glass — Frazer Lee

It may cost you your soul.

Daniel Gates is a fixer. Whatever his client wants, he can get--for a price. But the price of his latest assignment is a high one indeed. He is to travel to Scotland to exchange a rare demonic text, a grimoire, for a consignment of even rarer whiskey. Reading the grimoire, Gates learns of the legend of Lucifer's Glass and the unholy trinity of green-eyed demons who protect it. As he does battle with the demons, Daniel realizes too late that there is much more to his assignment than meets the eye. He is locked in a struggle to save his very soul from damnation.