The Better Sister is a tense eight‑episode thriller on Prime Video starring Jessica Biel and Elizabeth Banks as two estranged sisters bound by tragedy. When the husband (and ex‑husband) they share is found murdered, the siblings are thrust into a web of suspicion, revealing buried resentments and shifting loyalties. As detectives dig deeper, the series delves into themes of family trauma, addiction, and the dynamics of wealth and power. With a stylish aesthetic and strong central performances, it offers a compelling, character‑driven mystery without giving anything away.