The original miniseries follows the story of Mei, a young woman born in China and raised by British parents who is called back to Guangzhou by her desperate birth mother (newcomer Mardy Ma) after Mei’s brother is wrongly accused of murder. One Child stars Katie Leung as the woman who struggles in the face of crisis to determine her family loyalties, true identity and the meaning of family. Elizabeth Perkins, Donald Sumpter play her UK parents. SundanceTV will air the four-hour mini, which it acquired in the spring, on December 5 & 6. One Child is a BBC Drama production for BBC Two, co-produced with SundanceTV and distributed by BBC Worldwide North America. Hilary Salmon is the executive producer. It marks the former Sundance Channel’s third consecutive collaboration with BBC Worldwide, following the mini Top Of The Lake, which won a Golden Globe for star Elisabeth Moss, and the upcoming The Honorable Woman, toplined by Maggie Gyllenhaal.