Ever since he learned about climate change, twelve-year-old Jonah has dreaded a weather-beaten future where not even his asthma medication can save him. Luckily, a girl from that future arrives just in time to throw Jonah a lifeline.

Sunny traveled back to the 2020s with a mission: help Jonah launch a climate strike big enough to rewrite history. To do it, he'll have to recruit his entire school before Halloween. Why so soon? Sunny won't say. But how can Jonah win over 600 classmates when the only thing he dreads more than the end of the world is talking to other kids?