Michael Schneider Variety Editor at Large “ER” alum Gloria Reuben has joined the cast of Prime Video‘s upcoming series “The Better Sister,” which also stars Jessica Biel, Elizabeth Banks, Corey Stoll and Matthew Modine. Based on the novel by Alafair Burke, “The Better Sister” stars Biel as Chloe, a woman whose life is upended when her husband Adam (played by Stoll) is brutally murdered — and the prime suspect shocks the family and exposes secrets. Banks plays Chloe’s sister, Nicky, who “hustles to make ends meet while trying to stay clean.” Reuben will play Michelle Sanders, described as “a respected lawyer who has made a career of standing up when she’s told to sit down.