'Maya Stern's Revenge and the Burkett Family's Downfall

Netflix's thriller series concludes with a shocking twist as Maya Stern avenges her sister's death, leading to the exposure of the Burkett family's illicit pharmaceutical practices.

Netflix's 'Fool Me Once' ends with the revelation that Maya Stern, played by Michelle Keegan, killed her husband Joe Burkett, played by Richard Armitage, in revenge for the murder of her sister Claire Walker.
Joe Burkett's family had been knowingly pushing out unsafe drugs, falsifying drug trials, and Claire, who worked for the company, was killed by Joe after she discovered the family's wrongdoings.
Maya Stern confronts the Burketts about their unlawful pharmaceutical practices and Joe's dark past, but is killed by Joe's brother Neil.
The entire confrontation was live-streamed online thanks to a nanny camera Maya set up in the Burketts' living room, effectively confessing their wrongdoings to the world.
The series ends with a glimpse into the future, showing Maya's daughter, Lily, raised by her extended family, away from the drama of the past.