Several years after the destruction of Romulus by a supernova, Jean-Luc Picard is no longer in Starfleet. He lives in his family's home in France, together with two Romulan refugees named Laris and Zhaban and with his dog, Number One. Picard is plagued by nightmares about Data and the Mars colonies where a fleet was being built to save the Romulans, and that was destroyed by "Synths", synthetic lifeforms that are banned in the Federation since this attack. Picard agrees to an interview with the Federation News Network on the anniversary of the Romulan disaster, but angrily walks away as the role of Starfleet and the ban on Synthetics are brought up. In an apartment in Boston, a young woman named Dahj has to witness how masked assassins murder her boyfriend, but she suddenly activates powers that enable her to kill the attackers. She watches the interview with Picard and somehow knows she has to seek his help. Picard offers Dahj to stay in his house, but she disappears before the next morning to protect him. In San Francisco, Picard accesses his personal archive. It contains a 30-year-old painting by Data that depicts Dahj and that is named "Daughter". Dahj finds Picard, but is attacked again and killed with acid. The assassins were Romulans. Picard wants to get at the bottom of Dahj's secret. He talks to Agnes Jurati of the Daystrom Institute in Okinawa, to learn that there has been research by Bruce Maddox on synthetic lifeforms that are indistinguishable from humans and that may have inherited traits from Data's positronic brain. They would have been created as twins. In Romulan space, Dahj's twin sister Soji is working in a facility on a Borg cube...

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