on Helping Writers become Authors:

Halfway through the Second Act, something marvelous happens. There you are, minding your own business, toiling in the seemingly endless desert of the Second Act, when everything changes all over again. Legendary director Sam Peckinpah talked about how he always looked for a “centerpiece” on which to “hang” his story. That centerpiece is your Second Plot Point, the Midpoint, which divides your Second Act.

The Midpoint is what keeps your Second Act from dragging. It caps the reactions in the book’s first half and sets up the chain of actions that will lead the characters into the Third Act. Like all major structural turning points, the Midpoint directly influences the plot. It changes the paradigm of the story, requiring a definitive and story-altering response from the characters. This time, however, the protagonist’s response is no longer just a reaction. This is where the protagonist begins to take charge of the story by moving proactively against the antagonistic force and zeroing in on the final plot goal.