Pitch the whole kit and kaboodle! In paragraph 1, deliver your series hook, stating in a single sentence the main premise of the series (as in “a brother and sister use a magic tree house to travel through time”). In paragraph 2, position the series, comparing it to similar series for your audience but very clearly stating how yours is unique from the others. If your series has a main thread to be resolved over its course, describe here how you’ll address, sustain, and resolve that thread. Offer the manuscript for the entire first book (which must be written) and provide a page with synopses of two or three other adventures. Paragraph 3 is for your writing credentials. Voila! A series query.