While The Better Sister has prestige talent involved, the series can’t overcome its campy, Lifetime-esque vibe to be taken too seriously. I mean, this is a show where rich Chloe (Jessica Biel) is married to murdered Adam (Corey Stoll), who is unstable Nicky’s (Elizabeth Banks) ex-husband. Also, Chloe and Nicky are sisters. That is the level of movie-of-the-week plot devices we are dealing with here, and they come with over-the-top acting, derivative twists, and all the typical genre clichés. If trashy thrillers — and I use that term lovingly — are your thing, then give it a go. Otherwise, this is another forgettable “beach read” show.