17-year-olds Lizzie, Ella, and Betsey Best grew up as identical triplets... until they discovered a shocking family secret. They're actually closer than sisters, they're clones. Hiding from a government agency that would expose them, the Best family appears to consist of a single mother with one daughter named Elizabeth. Lizzie, Ella, and Betsey take turns going to school, attending social engagements, and a group mindset has always been a de facto part of life... Then Lizzie meets Sean Kelly, a guy who seems to see into her very soul. As their relationship develops, Lizzie realizes that she's not a carbon copy of her sisters; she's an individual with unique dreams and desires, and digging deeper into her background, Lizzie begins to dismantle the delicate balance of an unusual family that only science could have created.