Books in the A Tale of Ten Kingdoms series

She wiped her brow with her right arm before pulling her sleeves to her elbows revealing a simple black tattoo on her left forearm. The characters "23C9T798Z" had been etched into her skin the day she was born. It was a part of her. It was her name. Two-3, as her family called her, had always had questions. Did she voice them? No. No one questioned things, but she knew she wasn't the only one with doubts. Or was she? Her father had vanished years before leaving Two-3 and her little sister, Eight-R, to be raised by their mother. Most days, however, the daughters were the caregivers. A state-mandated drug kept their mother in a drunken stupor. When Eight-R vanishes while participating in a new government treatment program Two-3 has no choice but to seek answers. What she finds is far worse than she had ever imagined.