Here are some wise words from Mr. Epes Winthrop Sargent, in The Moving Picture World:
“The successful seller of synopses first makes his story interesting, not through inflated literary style, but through clearness in the exploitation of idea. He makes his second point through the fullness of the necessary detail. His third point is made through the omission of unnecessary detail. His last advantage is that he knows when to give scenes that are out of the ordinary and leaders that will be useful to the continuity writer. He undertakes to sell no more than an idea, and, selling an idea, he does not confound it with history nor expect the buyer to be a mind reader. That is the great trick in synopsis writing. Learn what to put in and what to leave out. Learn to tell what the continuity writer needs, and learn to omit the things that will suggest themselves to the imagination of any intelligent plot-handler.”
6. The Form of the Synopsis
An examination of the scripts of some amateur photoplay authors shows that there is a frequent tendency to misunderstand the form in which the synopsis should be written. This may be due to the writer’s being impressed with the necessity for not making his synopsis too long. At any rate, the examples we have in mind are written—the story is told—exactly as the scenario should be written, only even more briefly and without being subdivided into numbered scenes. Thus, instead of writing: “Blake conceals himself behind a boulder and, as Tom is about to pass him, steps out and orders him to throw up his hands. He compels Tom to surrender his revolver and cartridge belt, hastening Tom’s actions, when he momentarily hesitates, by firing a shot close to his head;” the writer may say: “Blake sees Tom approaching up path. Hides behind boulder. As Tom is about to pass boulder, he is held up by Blake, who makes him strip off gun and cartridge belt. Tom too slow in actions, so Blake shoots past his head. Tom drops belt and gun on ground, etc.” Obviously, the mistake consists in not writing the synopsis in narrative form.