Middle-school band geeks Dev, Isaiah, Tessa, Maeve, and Lewis are trapped in a parallel version of Earth as they fight to save their families--and the rest of the multiverse--from the villainous Empyrean One.

"In the two years since his mother was killed in an automobile crash, Colin has been anticipating further disasters, writing down what to do in the event of an avalanche or mentally practicing the Heimlich maneuver just in case--but the real trouble is that his mathematician father is obsessed with a classic math problem and has a hoarding problems that is spiraling out of control, leaving Colin desperate to hide this chaos from his friends and everyone else, even as he struggles with his own grief"--Provided by publisher.