"Seven Percent of Ro Devereux," Ellen O'Clover's intriguing debut for teen readers, follows a bright high school student who invents an app that will predict the future of its users.and now lives in Colorado, sets her story in a mountain town in that state. Here, the title character lives with her father, who has inherited the family coffee shop, and next door to grandmotherly Vera, a recently retired professor of behavioral science.
The only snag is that XLR8 insists that Ro serve as the face of the app, and proof that its matchmaking abilities are valid. And when she submits her information, she is matched with Miller, an old childhood friend from whom she has been estranged for three years. At the same time, Ro begins to fear that the app is being marketed as more reliable than it actually is, and that the effects on its users, particularly the young ones, can be dangerous. When the company – which now owns 50% of the app – won't listen to her concerns, she and Miller come up with a plan to deal with the problem on their own.