When a virus makes everyone over the age of eighteen infertile, would-be parents pay teen girls to conceive and give birth to their children, making teens the most prized members of society. Girls sport fake baby bumps and the school cafeteria stocks folic-acid-infused food. Sixteen-year-old identical twins Melody and Harmony were separated at birth and have never met until the day Harmony shows up on Melody’s doorstep. Up to now, the twins have followed completely opposite paths. Melody has scored an enviable conception contract with a couple called the Jaydens. While they are searching for the perfect partner for Melody to bump with, she is fighting her attraction to her best friend, Zen, who is way too short for the job. Harmony has spent her whole life in Goodside, a religious community, preparing to be a wife and mother. She believes her calling is to convince Melody that pregging for profit is a sin. But Harmony has secrets of her own that she is running from. When Melody is finally matched with the world-famous, genetically flawless Jondoe, both girls’ lives are changed forever. A case of mistaken identity takes them on a journey neither could have ever imagined, one that makes Melody and Harmony realize they have so much more than just DNA in common. From New York Times bestselling author Megan McCafferty comes a strikingly original look at friendship, love, and sisterhood—in a future that is eerily believable.

It’s been thirty-five weeks since twin sisters Harmony and Melody went their separate ways. And now their story has become irresistible: twins separated at birth, each due to deliver twins…on the same day! Married to Ram and living in Goodside, Harmony spends her time trying to fit back into the community she once believed in. But she can’t forget about Jondoe, the guy she fell for under the strangest of circumstances. To her adoring fans, Melody has achieved everything: a major contract and a coupling with the hottest bump prospect around. But this image is costing her the one guy she really wants. The girls’ every move is analyzed by millions of fans eagerly counting down to “Double Double Due Date.” They’re two of the most powerful teen girls on the planet, and they could do only one thing to make them even more famous: Tell the truth.