The first Bad Sisters was an adaptation of a Belgian limited series, so only one "season". I've not seen the Belgian original, but reading the episode summaries on Wiki, sounds like season 1 of Bad Sisters followed it almost to a T. Even a lot of the character names were the same. I don't know if the plan for Bad Sister was also just a limited series, or if they'd planned to do subsequent series from the start, but either way, they had no source material to go with for season 2, and that doesn't always go very well.
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