In episode 10 of Bad Sisters, the police inspect John Paul Williams' dead body. He sits on his dirt bike, which seems to have crashed against a tree. Grace says they had her birthday dinner. When she wanted to turn in early, he got angry with her and left to go to the pub to watch a football match. Matt is still on the case. He already knows the Garvey sisters lied about where they were that night. Next, he interviews Roger, who confesses what John Paul did to him, how he tore apart his life for his own amusement. He tells Matt he was at the cabin the night John Paul died. He went there so he could forgive him. Matt then goes across the street to speak to Grace as she's going inside. He tells her all the things he's found out. "He wasn't a proper man was he?" He asks of John Paul. Grace ignores him, nervously making her way inside. She goes up to John Paul's study and logs onto his laptop, discovering his history of pretending to be Oscar. Still at the cabin, Matt plays the disc that's in the DVD player. He watches a clip from the movie that shows a woman being strangled. He then realizes that Grace used the film as inspiration. She used the yarn in the trash bag he stole as part of her murder plan. Meanwhile, the sisters are comforting her. Grace says she was knitting and watching a movie that night, which helped her know what to do with JP's body. She dressed him in a red scarf, then tucked the scarf into the wheel-just like in the movie. Later, she buried him in her murder weapon-his pajamas. Matt calls Becka to tell her he's been to the cabin and knows what happened to John Paul. Becka insists to her sisters on meeting Matt alone. Isn't it funny that all the effort the Garvey sisters put into saving Grace, only ended up implicating her in a murder she herself committed? I think if the other sisters had never done anything, Grace could have covered her own tracks well. A clumsy trail of murder attempts wouldn't have led to her. Luckily for her, however, sometimes the law doesn't need to win. Sometimes compassion can.
Bad Sisters concludes its threads with a believable ending that ties all its pieces together. Pointing back to some of Grace's actions in the first episode was a nice touch-such as how she buried John Paul in pajamas, and how she lied about being with her sisters. It would have been easy to read Grace's nervous actions throughout the series as a timid personality-but the finale reframes everything.