Sage Alexander and the Hall of Nightmares

Introducing a teenage hero destined to save the world in "an action-filled fantasy adventure" that's the basis for the TigerBeat TV series (School Library Journal).
Descended from humans and angels, fourteen-year-old Sage Alexander has the power to see and fight the demons, vicious half-humans, and evil creatures of myth and legend that prowl the earth, invisible to human eyes.
The Seven Princes of Hell, the seven deadly sins—Greed, Sloth, Envy, Gluttony, Lust, Wrath, and Pride—all breathe their sin into weaker human ears and take those willing souls for their own, as they have for centuries. And now Mammon, Greed incarnate, has possessed Sage's father and threatens to keep him forever. The Angelic Response Council, a committee of angels, archangels, guardians and half-angelic humans, has fought the forces of blackest evil for centuries, but their numbers are dwindling.
There is prophecy of a gifted warrior, who will come in the Council's darkest hour to bring about the demise of the fallen angels. His name is Sage Alexander. With a supernatural team, he must face danger and death and battle his way through time and Godspace in order to save his family from the grips of Greed. But he has an even bigger quest ahead of him. This is only the beginning . . .
"Copling plays delightfully with myths and history, creating a vast world of literature, knowledge, and belief. This novel was perfect for my geeky side!" —San Francisco Book Review
"An intricate, adventurous novel . . . Sage's journey, personal in saving his father and noble in saving the world, is worth rooting for." —Foreword Reviews