How to Catch a Monster by Adam Wallace (2017)
Get ready to laugh as a young ninja heads into the closet to meet the monster that's been so scary night after night! But what if things aren't what they seem and our monster isn't scary at all? What if our ninja hero is about to make a friend of strangest sort? If you dare to travel beyond the closet door and into the land of the monsters... you might just find the very best reward of all. But with robots, lava pie, and a smattering of traps―catching monsters is no easy business!