Most rejections happen before anyone reads your first page. A UK agent with a healthy list can receive dozens of approaches in a week, and the decision to read on is usually made in seconds, from a covering letter, a synopsis and a sample that either match what was asked for or don't. The encouraging part is that almost every reason a submission gets passed over is fixable, and none of it depends on knowing someone in publishing.

1. Writing a covering letter that describes the book instead of selling it

The covering letter is not a blurb, a themes essay, or a summary of every plot beat. It is a pitch with a job to do: tell an agent what kind of book this is, who it is for, and why they should want to read it.

Keep it to roughly one page. Open with the title, genre, word count and a single line that captures the premise. Follow with a short paragraph of story — protagonist, problem, stakes, and the tension that drives the middle. Then one or two sentences on why this particular agent, drawn from their list or what they have said they are looking for. Finish with a brief note about yourself if it is relevant: publications, prizes, relevant expertise, or a line explaining that you have no publishing history at all. That last part is fine. Agents sign debut authors constantly.

What undermines letters far more often is tone. Avoid rhetorical hooks such as "What if your worst nightmare came true?", avoid claiming your novel will appeal to every reader, and avoid comparisons to bestsellers as a boast. Two recent, specific comparison titles — "for readers of X and Y" — tell an agent more than three hundred words of description.

2. Pitching agents who do not represent your kind of book

This is the mistake that wastes the most time, usually in both directions. An agent with a specialism in children's fiction will not take your adult crime novel. An agent who represents non-fiction by experts will not sign your rom-com. Sending anyway does not show initiative; it shows that no research was done.

Do the reading before you send:

• Check the agency's own submissions page for who handles your genre and whether they are open at all. Many close for periods during the year.
• Look at what the agent has said in interviews, on the agency website or in trade press announcements about deals they have made recently.
• Follow them if they post about the work they want. Those posts change and are worth checking shortly before you send, not months earlier.
• Notice the category as well as the genre. Children's and YA are handled by separate agents, with different expectations, at most agencies.

One more rule worth knowing: at many agencies, submitting to several agents there at once is not welcome. Pick the best fit and send to that person alone.

3. Ignoring the submission guidelines

Guidelines are not bureaucracy. They are how a busy office sorts a large pile into something readable, and following them is the simplest way to look professional. They commonly specify, in some combination:

• Whether to send a covering letter, synopsis and sample, or the complete manuscript
• How much sample material — often the first three chapters, the first 10,000 words, or the first fifty pages
• Formatting: usually a single document, double-spaced, with your name, title and page number in the header
• Whether submissions go by email or through a web form, and whether attachments are allowed at all
• Whether simultaneous submissions are acceptable, and whether an exclusive is requested
• Response times, and whether they reply to everyone or only to submissions they want to take further

Send exactly what was asked for. If the instructions say paste the opening chapters into the body of the email, do not attach a file. If they say no attachments, send none. If they ask for a one-page synopsis, do not send four pages. Small deviations are the ones that get spotted instantly.

4. Sending work that is not ready

Agents want a finished, edited manuscript, not a promising opening and a plan. If you are writing non-fiction, the opposite often applies — a proposal with a sample chapter and a clear sense of your platform can be enough — but for fiction, finish the book first.

Know the broad conventions of your category. Adult novels in most commercial genres sit somewhere between 70,000 and 100,000 words. Young adult usually runs shorter. Middle grade shorter still. These are conventions rather than laws, and a brilliant book can break them, but a 240,000-word debut fantasy asks an agent to take on a very large risk.

Before you send anything, read your first ten pages aloud. That is where typos, clumsy dialogue and head-hopping do their damage. Give the manuscript to readers who will be honest with you rather than reassuring, and use their notes. If you are pitching a series, describe the first book as a standalone with series potential; agents want to know the first one works on its own.

5. Misreading silence, and chasing badly

Most agencies state that no reply by a certain date means no. That is standard, not personal, and it is not an invitation to send a follow-up every fortnight. If the stated response window has passed and you want to check once, send a short, polite email and then move on.

Keep a simple record as you go: date sent, agent, agency, what you sent, and the outcome. It stops you submitting the same book to the same person twice and makes it easier to plan the next round. If an agent takes the time to give feedback, thank them for it; a gracious reply costs nothing and occasionally leads somewhere when your next book is ready.

Finally, be wary of anyone offering representation for a fee, or promising to read your work for payment. Agents earn commission on deals they make. They do not charge authors to submit. If money is being asked for up front, walk away.

A practical routine before you press send

You do not need to get everything right at once, but you do need to get the basics right every time. Try this sequence for each submission:

1. Read the agency's submissions page in full, including any date restrictions, then read it again.
2. Write the covering letter fresh for that agent, naming them and one genuine reason you are approaching them.
3. Check that your word count, genre and sample length match what is asked for.
4. Proofread the first three pages specifically, since that is where the decision is made.
5. Log the submission, note the expected response date, and start the next one.

The authors who get signed are rarely the ones who were perfect first time. They are the ones who treated each rejection as information, tightened the letter, checked the guidelines, and kept sending to the right people.

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