One night Tila stumbles home, terrified and covered in blood. She's then arrested for murder, the first by a civilian in decades. The San Francisco police suspect involvement with Verve, a powerful drug, and offer her twin sister, Taema, a chilling deal. Taema must assume Tila's identity and gather information to bring down the drug syndicate. The police may then let her sister live. However, Taema's investigation raises ghosts from the twins' past.
Raised in the closed cult of Mana's Hearth and denied access to modern technology, conjoined sisters Taema and Tila dream of a life beyond the walls of the compound. When the heart they share begins to fail, the twins escape to San Francisco, where they are surgically separated and given new artificial hearts. From then on they pursue lives beyond anything they could have previously imagined.