The Tethered World by Heather L. L. FitzGerald and gives it 5 claws!
4.5 stars for this imaginative, witty adventure reminiscent of Narnia. I love that the story features a homeschooling family (since we were one) with an autistic child who has a special destiny. There are Trolls and Ogres and other scary creatures in this subterranean magical world along with Gnomes, Dwarfs, Elves, Fairies, and Nephilim. It's fun to experience this story through the eyes of the MC, the oldest child in the family though the climactic battle was over too quickly and too easily. Otherwise well-written with a steady, unfolding pace. I'm glad there are more books because this world and the characters can easily support a larger story."