The Shadowlands (The Shadow Knight Saga Book 1)

For centuries the bastard offspring of the Fallen had kept the Underworlders of the middle realm who dwell on the surface, the Shadowlands, in check while maintaining the balance. But an unseen evil threatens to upset the balance, and cause civil unrest in the Fae community, putting the young Shadow Knights struggling to maintain order in the middle of a war that will destroy all realms by creating a bridge from Hell to the Shadowlands.