This Emmy-winning HBO film based on a true story follows white surgeon Alfred Blalock (Alan Rickman) and his black assistant, Vivien Thomas (Mos Def), who teamed in the 1940s to develop a procedure to save children suffering from a heart defect. But Thomas's status as a second-class citizen prevented him from getting recognition, as Blalock took all the credit. Their relationship, while close, was complicated by the social realities of the time.