'The Sinner' Season 2: Heather and Marin's story-within-a-story lays out the clues
Heather and Marin are not just two separate characters in 'The Sinner' who can be passed off as bystanders. Their story might just be as important as Julian's own. The subtlety of the second season lies in the fact that it has managed to weave one story within another without distorting the design. Season 2 began with the question of why would a 13-year-old boy kill his parents. However, pretty soon into the first two episodes, it was clear that this season is not just about that one question.
Episodes 1 and 2 surely have set the pace for the murder mystery to slowly unravel itself while covering up the gloomy past of Detective Harry Ambrose. However, by the third episode, it seems that 'The Sinner' has diverted its audience towards another equally important pair of characters: Detective Heather Novack ( played by Natalie Paul) and her school sweetheart, Marin (played by Hannah Gross). While talking about her relationship with Marin and how it has helped Heather grow, Paul said, "Incidences from my high school years and my teenage years with my best friend reveal more about how Heather got to be who she is...We were trying to figure out the 'why' of the case, but you also see more about the 'why' of the detectives."