Planting early hints of what is to come, so a later turn feels surprising yet inevitable.
Foreshadowing seeds a detail - an object, a line, a small event - that pays off later, letting a twist land as both a shock and a confirmation. It's the machinery behind 'I should have seen it coming': the clue was there, weighted lightly enough to slip past on a first read.
It works by proportion. Too faint and the payoff feels arbitrary; too heavy and the reader is ahead of the story. The craft is calibrating the hint so it barely registers now and rings clearly in hindsight.
Plan with 30+ story frameworks, write your screenplay or novel, and let Quill coach every beat - it guides and never writes. Free account, no card.