Mrs. S is Sarah and Felix’s adoptive mother whose compassion is matched only by the hard love she dishes out. The caretaker of Sarah’s daughter Kira, S has spent much of the latter part of motherhood keeping Kira safe from Sarah’s unpredictable world. After reuniting with her mother, the clone "original" Kendall Malone, S suffered a striking blow when she was killed by Neolution. With her network in disarray, it's clear to S that it's time for desperate measures. She’ll do her best to guide Sarah through this next phase of motherhood, while maintaining a dark alliance behind the sisters' backs... an alliance that she fears may tear all their lives apart.