I got this question recently:
“Is it okay to include a two page synopsis with a query letter, or does this fall under the ‘Unsolicited Submissions Will Be Thrown in the Trash’ policy of so many production companies and agents?”
I would keep your synopsis short, like less than 1 page, but certainly not two. There are no exact rules for this but keep in mind who our you’re submitting to: a very busy person who gets lots of submissions. If you’re having trouble boiling your story down to a half page it means you’re probably not too clear on what your story is all about, which is a very bad sign. My advice is to get your query letter down to less than half a page and to also get your synopsis down to less than half a page.