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As Nicholson’s lovelorn codependent shifts personalities as she changes from partner to partner, Baker asks how headstrong girls grow up to become malleable women.

Thankfully, with her baked-in edge, Thatcher is quite good at the mix of deadpan and strength the role requires — and it’s very much OK if you don’t entirely believe her in those first scenes as an apprehensive codependent.

This connection helped Doupe and Petticrew get through some dark days on set and also served the storytelling well: the Price sisters have what can only described as an intense, codependent relationship, which becomes even more deeply intertwined during their imprisonment.

"Objectively, the film is also a critique of a codependent relationship between a very perverse narcissist and a very vulnerable, echo personality," Szaniawski said of the dynamic between Jack and Wendy.

Her co-star Theroux brought her around to the idea that Lydia would find herself in a codependent relationship with someone who doesn’t necessarily have her best interests at heart.