Zach Lopez vs. the unicorns of doom

When eighth-grader Zach Lopez starts school (where his mother is the newly appointed principal) in Devil's Pass, Minnesota, he expects to be miserable; after all he is a transplant from Los Angeles and the only Puerto Rican in the school--what he does not expect is the sinkhole in the middle of the park with a connection to the "otherside" and a town regularly beset by the monsters who come through it, but he soon learns that Devil's Pass specializes in the weird and dangerous.