A secondary plotline weaved into the story. There could be more than one of these. All these subplots usually clash with the primary plot down the line. For example, In Se7en, we spend time with Mills’ wife, so that we understand his agony when the box arrives.
It’s important to make the subplots feel like the part of the same movie and have them thematically related to what’s going on in the primary plot.
Using the same example, Se7en is about whether hope can blossom in a dark world where evil men like John Doe exist. In the primary plot, this theme is reflected in Mills’ corruption by John Doe. Similarly, the subplot with Mills’ wife is about her confiding in Somerset that she’s pregnant but contemplating about having an abortion as she is unsure about bringing a child into an immoral, dark world.
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