How to write an effective query letter
A query letter is a note asking an agent if they’re interested in representing a book. Agents may receive a dozen or more queries a day — and might only sign four or five authors per year. So you can see how making a good first impression in your query is crucial!
Now, there's no "standard" format that all authors use for their letters. However, a query is a business document and as such should look like a formal one-page business letter.
Before we start, let's answer this popular question right off the bat: how long should a query letter be? Our universal piece of advice is to keep the letter short. (Think 300 to 400 words at the very most.) Many agents field queries using their phones, so think about how your will letter look on a small screen. Does it give the impression of being a huge wall of text, or a disjointed series of singles sentences? If so, revise to make it more concise, orderly, and organized.