For twelve-year-old Dashiell Gibson, living on the moon is a dream come true. Except for the low-gravity lunar toilets. And the food. And the part where his best friend lives about 250,000 miles away. And how there are almost no other kids up here, except for his kid sister and a couple of billionaire bullies. Oh, right, and the fact that a fellow lunarnaut just died—and only Dashiell knows that his death wasn’t an accident.

Plenty of people on the moon base are hiding something, but which of them are capable of murder? It’s up to Dashiell to figure it out—before the killer strikes again.