Middle Grade Horror

After his grandmother receives a mysterious invitation for "High Coffee" in the Gorgantic, the world's largest building, Igz accompanies her to the skyscraper nestled in the heart of New York City. But it's clear almost immediately that something is off; there are paintings on every surface he sees -- some of half-human / half-insect monsters, and some that seem to move. And the more time they spend inside the Gorgantic, the clearer it becomes to Igz how many dark secrets the building contains -- all of which seem centered around the art...