Gates McFarland's mother has just been proclaimed brain dead by a neurologist. But fifteen-year-old Gates doesn't believe it's true, because she hears her mother's voice in her head. The command is simple: Find my heart. It's the last thing Gates hears from her mother before the neurologist pulls the plug. After contacting the Organ Procurement Agency, Gates learns there is no record of her mother's organ donation. She meets Dr. Ascuitto, her mother's neurologist. A menacing figure, he threatens to institutionalize Gates if she continues her inquiries. Determined to find the truth, Gates gets help from John Ed, a street-smart, sixteen-year-old recovering addict. Together, they navigate an underworld of body theft, interstellar drug trafficking and doctors who double as dealers. She finds herself attracted to John Ed's musical talents and emotional strength even as she is drawn ever-deeper into an alien world accessible only by use of a hallucinogenic spore. Hostile and governed by a sinister waif named Penny, the world holds secrets about Gates' mother's death...and the key to Gates' survival.