Centuries after wars nearly destroyed civilization, the two islands of New Pacifica stand alone, a terraformed paradise where even the Reduction—the devastating brain disorder that sparked the wars—is a distant memory. Yet on the isle of Galatea, an uprising against the ruling aristocrats has turned deadly. The revolutionaries’ weapon is a drug that damages their enemies’ brains, and the only hope is rescue by a mysterious spy known as the Wild Poppy. On the neighboring island of Albion, no one suspects that the Wild Poppy is actually famously frivolous aristocrat Persis Blake. The teenager uses her shallow, socialite trappings to hide her true purpose: her gossipy flutternotes are encrypted plans, her pampered sea mink is genetically engineered for spying, and her...