Arturo's town conceals a secret beneath layers of sediment in an ancient lakebed. It may be why a boy, Arturo, has brought home a sentient basalt pyramid, or why he begins to see a triangular shadow cast by his body. In his town, rumors and suspicions swirl about in the wind, and truth, he finds, is a creature that lives in a lake. A lake, along with the inhabitants along its shore, that may or may not be returning to their land.