The Better Sister Ending Explained: Who Killed Adam and How They Got Away With It
Prime Video’s suspenseful thriller The Better Sister wraps up with a shocking finale that reveals the truth behind Adam’s murder. Starring Jessica Biel and Elizabeth Banks, the series follows two estranged sisters brought back together by a deadly secret. As the mystery unfolds, viewers are left guessing who really killed Adam and why. Let’s break down The Better Sister ending and explain who was behind the murder, and how they managed to walk away free.
Stream The Better Sister Season 1 now on Prime Video UK.
Who Are the Main Suspects?
Throughout the eight-episode series, suspicion falls on several characters. There’s Chloe (Jessica Biel), Adam’s wife at the time of his death. Then there’s Nicky (Elizabeth Banks), his ex and the mother of his son, Ethan. Even Ethan, now a teenager, seems like he could have a motive. But who actually committed the crime?
Why Adam Was Killed
As the story reaches its climax, we learn Adam had been abusive toward both sisters. In one disturbing scene, Ethan sees his stepfather violently shove Chloe during an argument. Though Adam didn’t know he was being watched, Ethan saw everything from the balcony.
After witnessing the abuse, Ethan secretly contacts his mom, Nicky, using a hidden burner phone. Nicky, deeply concerned, rushes to help Chloe leave Adam. But when she confronts him, things spiral out of control. Adam becomes aggressive again, this time attacking Nicky directly.
We also discover a dark piece of Adam’s past. When he was with Nicky, he once drugged her and left her to drown, just to gain custody of their son.
How Adam Was Murdered
During the heated confrontation, Nicky defends herself with a switchblade and stabs Adam multiple times. She runs from the scene, still holding the knife. But there’s a twist, Ethan is actually the first person to find Adam’s body, not Chloe. Instead of calling for help, Ethan chooses to stay quiet, knowing that doing so could protect his mom or stepmom from getting blamed.
How the Sisters Framed Someone Else
Later, Nicky confesses everything to Chloe. Rather than turn her sister in, Chloe decides to protect her. She comes up with a bold plan to frame someone else, Bill Braddock (played by Matthew Modine), a senior partner at Adam’s law firm.
Chloe discovers Bill was involved in illegal activity, including human trafficking. During a visit to his house, she secretly plants the murder weapon in his desk. She then feeds information to the police that makes it look like Bill had a motive to kill Adam to cover up his crimes.
What the Detective Uncovers
Detective Nan Guidry (Kim Dickens) begins to suspect Chloe. She realizes Chloe knew about Adam’s death before it was officially announced, an obvious red flag. But before she can make an arrest, the sisters leak damaging information about Nan’s past involving police misconduct. This leads to her suspension, and the investigation stalls.
With Bill already behind bars and the detective out of the picture, the case is considered closed. Chloe and Nicky walk away free.
How The Better Sister Ends
The final moments of The Better Sister show the two sisters reunited. With Adam gone and Bill taking the fall, they promise to stay together and focus on rebuilding their lives with Ethan. The message is clear, nothing will come between them again.
The Better Sister Season 1 delivers a chilling but satisfying ending. It shows how far sisters will go to protect each other, even if it means bending the law. With twists, secrets, and emotional depth, the finale keeps viewers hooked until the very last scene.