In a book report, the "complication" refers to the
conflict or problem that arises in the story, disrupting the initial equilibrium and driving the plot forward. It's the event or series of events that creates challenges for the protagonist and makes the story interesting. It's the *opposite* of the resolution.
Think of it as the inciting incident and the subsequent obstacles the main character faces. It's more than just a minor problem; it's a significant challenge that needs to be overcome.