Darkness Awakes. Blackwell Magic, #5

The Northshield Nexus hides a rift, a breach between our reality and one populated by horrible monsters. But they want out. Ryan's fought one of them and the battle almost killed him. Now a legion of the creatures is trying to break free from their extra-dimensional prison. They've found humans willing to help them smash down the magical barriers keeping them locked away. Ryan has to stop them. If the demons invade Earth, everyone he's ever known and loved will be in jeopardy.
Even his magic won't be enough to save them. Stopping their human catspaws before they can accomplish their mission is the only hope. But they know Ryan is coming for them. They know his strengths and his weaknesses, and have a plan to stop him in his tracks. They think they know Ryan Blackwell, but they've never faced off against him when his friends' lives are on the line. Can he stop this deadly menage before the Darkness Awakes and destroys our world?