Logline

What it is

A logline is one sentence that tells a stranger what your book is about and why it matters. It is the answer to the question every reader, ad platform, bookseller, and agent asks first: in a line, what is this story? Borrowed from screenwriting, where a film gets pitched in the time it takes to ride an elevator, it now does the same work for a novel: a blurb opens with it, an ad headline is its shortest cut, and a query letter opens with it too.

A working logline rests on three parts: a specific protagonist, a concrete want, and the obstacle between them. Drop any one and the sentence goes vague: "a woman must overcome her past" tells us nothing, because there is no specific want and no specific thing in the way.

What each part looks like:

• A specific protagonist: not "a detective" but "a disgraced lip-reading detective." The detail does the work; it promises a particular book, not a category.
• A concrete want: the goal that organizes the plot. To clear her name, to reach the capital before the thaw, to win back a stolen birthright. A want you can fail at.
• A real obstacle and its stakes: the thing in the way, and what it costs if the want goes unmet. The obstacle is what turns a premise into a story.

A logline is not a tagline or a synopsis

Three forms get confused. A tagline is the mood line on the cover ("Some doors should stay closed"); it sells a feeling, not a plot. A synopsis walks the full arc, ending and all, across a page or two. A logline sits in between: one sentence, plot-shaped, no ending revealed. It is the most compressed honest description of the book that still makes someone want to read it. Get the logline right and the query letter, the elevator pitch, and the comp-titles conversation all get easier.

Where a series author uses the logline

The same sentence does six jobs at launch, and it has to survive all of them.

• The blurb: the first line on the product page. The reader decides in that line whether to keep reading.
• The ad: the headline in an Amazon or BookBub ad, cut to fit.
• The short video: the spoken hook in a TikTok or a Reel.
• The series page: the one-liner under the series title.
• The newsletter: the subject line of the launch email.
• The pitch: the opening of a query letter, for the deals that need one.

Marketing is the job 78.5 percent of indie authors call the hardest part of self-publishing (Written Word Media, 2024). A logline that holds across all six jobs is the cheapest marketing asset you own.

A series needs two loglines

Book 1 needs a logline. The series needs one too: the promise that carries a reader from Book 1 to Book 6. In a healthy series, 50 to 60 percent of Book 1 readers buy Book 2 (Kindlepreneur). A logline that promises a want the book never delivers produces the review “this is not the book the description sold me”, and the reader who writes it does not buy Book 2. Write the series line first. Then write each book's line so it pays a piece of the series promise.

An example

Here is the difference a specific want and obstacle make, using the same book described two ways.