Trapped in a violent, controlling relationship with a wealthy and brilliant scientist, Cecilia Kass (Moss) escapes in the dead of night and disappears into hiding, aided by her sister (Harriet Dyer, NBC's The InBetween), their childhood friend (Aldis Hodge, Straight Outta Compton) and his teenage daughter (Storm Reid, HBO's Euphoria). But when Cecilia's abusive ex (Oliver Jackson-Cohen, Netflix's The Haunting of Hill House) commits suicide...