Lone wolf contract killer and pre-operative transgendered woman Mia (Golden Globe-winner Chloë Sevigny) is struggling with her own identity when she receives a letter from her dying ex Wendy informing her that she has been named the legal guardian of the 11-year-old son she's never met, as well as his three half-siblings. As her growing maternal instincts throw her future as a cold-blooded killer into question, Mia's own life, as well as the lives of her resentful children, will be changed in ways that none of them ever dreamed possible. Jonas Armstrong co-stars in this six-part mini-series from creator Paul Abbott (STATE OF PLAY, TOUCHING EVIL).