How to Write a Logline: A Practical Guide

At a dinner party in the spring of 2019, a man I had just met asked what my novel was about, and I talked for four minutes. I gave him the setting, the dead sister, the lighthouse, the two timelines, and a long aside about why the second timeline mattered. He nodded the whole way through. Then he said, "So it's a mystery?" I said no. He said, "A love story?" I said not exactly. He went to get another drink, and I stood there holding a book I could not describe.

That is the problem a logline solves, and it is a smaller problem than writers think. A logline is not a marketing line. It is a test of whether you know what happens in your story, who it happens to, and what it costs them. If you can write one sentence that holds those three things, you have a spine. If you cannot, the sentence is telling you something about the draft, not about your sentence skills.

This guide is about writing that sentence for a novel, a screenplay, a memoir or a series, and about what to do when it will not come.

What a Logline Is and What It Is Not

A logline is one sentence, usually between 25 and 50 words, that names a protagonist, the thing that disrupts their life, what they are trying to do about it, and what stands in the way. The term is usually traced to film, where it was the line in a studio's production log summarizing a picture. Novelists borrowed it because agents and editors began asking for one, and because the discipline is useful whatever the medium.

It is easy to confuse a logline with its neighbors, so here is the difference. A synopsis tells the whole story, ending included, in a page or two. A back-cover blurb teases and withholds. A tagline is a slogan: "In space, no one can hear you scream." The logline sits between them. It does not withhold the shape of the story the way a blurb does, and it does not walk through the plot the way a synopsis does. It states the engine.

Most loglines leave the ending out. They promise a question, not an answer. That is a convention, not a law, and it matters mostly for film pitches. In a query letter the logline is one sentence inside a longer argument; see how to write a query letter for where it goes.

The Four Parts Every Working Logline Carries

Strip the polish off a hundred loglines and the same four pieces keep showing up.

1. A protagonist, described by role. Not "Elena" but "a trauma surgeon who has stopped sleeping." One or two adjectives, chosen because the story is going to pressure exactly those traits.
2. An inciting incident. The event that ends the old life. It has to be something you could film: a letter arrives, a body is found, a husband does not come home.
3. A goal. What the protagonist actively tries to do. "Find her sister" is a goal. "Come to terms with loss" is a theme, and a theme cannot be failed.
4. An opposing force with a cost. What stands in the way, and what happens if the protagonist loses. This is the part writers drop first, and it is the part that makes the sentence read as a story rather than a premise.

Take a film everyone knows, and describe it in my own words rather than the studio's: the police chief of an island town that lives on summer tourists must kill a great white shark before the holiday weekend, while the mayor insists the beaches stay open. Protagonist by role, incident, goal, opposing force, cost. One sentence. You do not need the shark's name or the chief's backstory, and you do not miss them.

Irony, Pictures, and Why Blake Snyder Still Matters

Blake Snyder, in Save the Cat! (2005), asked more of a logline than the four parts. He wanted irony: a situation with a built-in contradiction that makes the listener lean in. He wanted a compelling mental picture, so that the reader sees the film from one line. He wanted a sense of audience and cost, so the line told you who it was for and roughly how big the thing was. And he wanted a killer title that did half the work on its own.

I think the irony requirement is the best single piece of logline advice in print, and the least followed. Compare two lines about the same invented novel. First: "A grieving widow searches for meaning after her husband's death." Nothing is wrong with it. Nothing is in it, either. Second: "A woman who spent thirty years as her husband's alibi learns, at his funeral, exactly what she was covering for." The second has a contradiction folded into it, and the contradiction is the plot.

Jessica Brody carried Snyder's method into fiction in Save the Cat! Writes a Novel (2018), where the logline is the first thing you build before you outline. You do not have to take the whole system to take that sequence. Write the sentence first, while the story is still cheap to change.

A Formula to Start From, and Where It Breaks

If you have nothing on the page, this scaffold will give you something to argue with:

When [inciting incident], a [protagonist by role] must [goal] before [opposing force / cost].

Filled in for a mystery: "When her brother's ashes arrive in the mail two weeks after his funeral, a trauma surgeon must find out who signed for them before the hospital board ends her career." That is thirty-three words and it already has a plot you can poke at.

The formula breaks on stories that are not built around a single external quest. A literary novel about a marriage, a collection of linked stories, a memoir structured as essays: none of these has a "must before" in it. For those, trade the goal for a pressure. What is the situation that will not hold? "In the single summer her parents decide to sell the farm, a fourteen-year-old who has never left the county starts keeping a ledger of everything she is about to lose." That is still a logline. It names a person, a disruption, a behavior and a cost. It just does not run on a countdown.

Five Ways a Logline Goes Wrong

It names the character instead of describing the role

The reader has never met your Elena. "Elena" costs them a syllable and gives them nothing. A role carries meaning on arrival.

It lists three plot points and calls them a premise

"A detective discovers a body, then a secret, then a conspiracy." That is a list of escalations with no person inside it. Pick the one event that starts everything and let the rest wait.

It uses abstractions where a thing should be

"Must confront her past" and "everything is at stake" are the two most common failures, and they fail for the same reason: you cannot picture either one. Replace the abstraction with the object. Which past? A letter, a debt, a name on a lease?

It runs past fifty words and hides the length with commas

A sentence that needs three clauses and a semicolon to hold its stakes is two sentences in disguise. Blaise Pascal, in his Provincial Letters of the 1650s, apologized for a long letter by saying he had not had time to write a short one. The logline is the short one. The time goes into cutting.

It has no cost

If failure costs the protagonist nothing, the reader has no reason to want success. Say what is lost, and make it specific to this person.

Writing Yours in Six Passes

1. Dump the story in three sentences. Beginning, middle, end, however clumsy. This is for you, not the logline.
2. Circle the inciting event. The one thing that, if removed, leaves no story. Write it as a clause with a subject and a verb.
3. Name the protagonist by role. Two adjectives, no more. If you cannot choose, the character may not be sharp enough yet, and that is worth knowing.
4. Write the goal as a verb you could watch. Rescue, expose, win, find, stop, steal. Not "realize."
5. Add the cost. Finish the sentence "or else." Make the "else" something a stranger would flinch at.
6. Cut to forty words, then read it aloud. If you run out of breath, cut again. If you stumble on a word, replace it.

Write five versions, not one. Different versions foreground different parts of the story, and the one that makes you slightly uncomfortable is often the right one, because it commits to something.

Three Loglines Built From Scratch

These are invented for illustration, so none of them is a real book you can look up.

Crime novel. "When a retired court stenographer realizes the transcript she typed in 1994 is missing eleven minutes, she must find the one witness who remembers them before the judge who ordered the cut is buried." Protagonist by role, a concrete incident, an active goal, an opposing clock.

Fantasy. "In a city where every debt is paid in years of life, a bookkeeper who has just inherited her mother's ledger must balance it before the creditors collect on a daughter who does not know she owes." The irony lives in the unit of currency.

Memoir. "After fifteen years of translating other people's letters at a border post, a woman opens the one addressed to her father and has to decide whether to deliver it." No countdown, but a decision, a person and a cost.

Read them again and notice that none gives a name, an ending, or a theme. Each is a situation under pressure. That is the whole trick.

Testing the Line Before You Trust It

A logline you like in your own head is not yet a logline. Test it on three people who have not read the book. Say it, then ask them one question: what do you think happens next? If their answers are wildly different from each other, the line is vague. If they all guess a cliche, the line is generic. If two of three guess something close to your actual plot and the third asks a good question, you have it.

Run one more test, a private one. Open your outline and find the scene where the inciting incident happens. Is it where the logline says it is? And does the final act pay off the cost named in the sentence? When the answer is no, the logline is not wrong. Either the book drifted from its premise, which is fixable, or the premise was never what the book was about, which is better to find out now. The same logline discipline carries into writing a screenplay, where the line often gets written before a single page does.

One Sentence, Used Everywhere

Once it works, the logline earns its place in four jobs: the line in your query letter, the first thing you say when someone asks, a header on your outline, and the filter you hold up against every new subplot. Does this scene serve the sentence? If not, it may still belong in the book, but it should have a reason.

If you want a fill-in structure with prompts for each element, the logline template walks through it one piece at a time.

I did write mine, a few weeks after that dinner. It came out eleven words shorter than I expected and carried one more consequence than I wanted. The next time someone asked what the book was about, I said it in one breath, and nobody had to guess whether it was a mystery.

Keep your logline where you can see it. Pin it to the top of your project in Plotiar, next to your outline and notes, so every scene gets measured against it. Try it free.