Finally Rebecka is getting some antidote into her body. Her pulse drops a beat, but then it rises slowly. At one point she wakes up speaking out laud: Lots of people will die.
Rebecka does not really remember why she said that.
The police have matched the blood sample from the cabin with the victim Mario, and they come to STB to take the fingerprints of all the widows. This looks really bad for them.
Uncle Mats might have some answers, and he might be drugged with the same drug as Rebecka. Kira and Johanne drive to the nursing home and get Uncle Mats out of there, and bring him in safety at STB.
Johanne is pissed off with Jesus for trying to kill Peter. She knows that Peter is innocent. Jesus now knows that it must be one of the widows that killed his brother, and he needs revenge no matter what. He overhears a conversation leaving him to believe it was Johanne.
The police notice that a leading drug cartel member is entering Sweden, and they keep strict observation. At the same time Peter has to check the fingerprints.
Loa wants to tie up all loose ends, and sends Ståhl to kill Mats and Rebecka. Mats is getting better with some of the antidote, and tells about Loa’s drug that will kill people.
Ståhl enters STB and when he is just about to kill Mats, Rebecka stabs him with a syringe containing the lethal poison. He runs off to CJ to get an antidote, but dies in the hands of CJ.
The widows need to destroy Loa’s lab, and they build a bomb to do the job. Peter is matching fingerprints, and realizes that Johanne was part of the killing of the hitman. He erases the evidence, but he also realizes that his love for her is in vain.
Jesus is back in the camper to get a gun, when Lisa (Rebecka’s daughter) comes in with the necklace of his brother. She tells him that she got it from Kira. Jesus is devastated, now he has to kill the love of his life.
The police follow the cartel member to Loa’s lab, where two other cartel members are meeting Loa. Loa gets a text message and walk out when the bomb explodes right in front of the police.
Jesus returns to the camper where Kira is. When he enters, she is on her knees asking him to marry her at gunpoint. He forgives her, and we end with a wedding.
Black Widow was broadcast on SBS ONE at Wednesday 8 November 2017, 13:00.