Dylan Alexander Prototype X-1689 is a sentinel, a cloned partially computerized human made to replace security systems in upper class homes. Sentinels are programmed to operate without emotions that hinder protective instincts, however in Dylan's case, the programming goes wrong-he falls in love. Rich and pampered, Emilie Grace Ragin has a bright disposition, who looks at the world in a way that no other human does. Raised from an infant with Dylan as her sentinel, she grows to want the forbidden-Dylan's love. Can they evade the Institution that made Dylan, and find happiness together? Or will the Institution succeed in finding Dylan, recycle him, and wipe all memory of Emilie from his brain?