Just like last year, “The Sinner” spent its penultimate episode of the season in a lengthy flashback to reveal answers to many of the questions that had been spun out from the beginning. “Part VII” revealed that not only was Marin (Hannah Gross) still alive, but that she was indirectly responsible for the mess everybody is currently in, including her son Julian (Elisha Henig) poisoning two Mosswood members with tea brewed with Jimsonweed.
The revelations actually begin a few days prior to Julian’s fateful act. While Marin has left her son behind to be raised at Mosswood, in the intervening years she tried and often failed to deal with some of her issues, whether it meant taking drugs, going into rehab, or finding religion. When she had finally gotten what peace she can, she returns to Mosswood not to do “the work,