Together Alone

When the Guardian's away, the demons shall play....
When Nick decides to take a well-deserved vacation, he has no idea the mess he's leaving behind. A demon army--the likes of which the world hasn't seen since the War of Separation--sits in wait at the edge of town, growing restless without the power of the Monsidian Orb to soothe them.
With the Guardian gone, it's up to Team Monster Force to fight off the invasion. But the members have been scattered, caught up in their own interpersonal drama. Wendy, Myles, Melody, and Jake must find the strength within themselves, even as they battle Together Alone.
Only Human on the Block Book III