Triggered by hitting a goose, Ady is sentenced to two years on a Mars outpost. Accident after accident leads to one conclusion: someone wants her dead. Dodging a Martian saboteur, she discovers a secret colony of ancestors and an approaching alien spacecraft but can't identify her would-be killer. Upon returning to Earth, she discovers her missing mother hid genetic research in Ady's mega-brain at the baby factory--information that could thwart the Android Police's secret plans to exterminate humanity.

She's Elma York (The Calculating Stars) meets Tom Swift's penchant for invention.