Idea, premise, logline and theme

Every script starts with an idea, but an idea is not yet a story. "A lighthouse keeper" is an image. "A lighthouse keeper who must decide whether to report a shipwreck that would make her a hero but expose her brother's smuggling" is the start of a story, because it contains a person, a choice and something at stake. This lesson shows how writers turn raw ideas into a premise, compress that premise into a logline, and discover the theme that gives a story meaning. These tools are not just for selling scripts. They are how writers test whether an idea can carry a film before spending months writing it.

Where ideas come from

Ideas come from everywhere: personal experience, news stories, family history, a place, an image, a "what if" question, a genre you love, or an injustice that makes you angry. Professional writers keep idea files and add to them constantly. Most ideas will never become scripts, and that is fine. The habit of collecting them trains you to notice dramatic situations in everyday life.

• Personal experience: write what you know emotionally, even if the setting is invented. A story about a first job in a kitchen can draw on any experience of being new and overwhelmed.
• "What if" questions: what if a town's only doctor lost her nerve? What if a grandfather's voice notes kept arriving after his funeral?
• Places and worlds: a remote research station, a night shift at a hospital laundry, a hockey rink at 5 a.m.
• Adaptation: short stories, plays, podcasts, articles and true events, which require rights, as lesson 12 explains.
• Genre: a fresh twist on a familiar form, such as a heist film set in a library.

For short films, the best ideas are often small and specific. A short cannot sustain a sprawling plot, but it can deliver one strong situation, one turn and one emotional change. Ask whether your idea can be told with two or three characters in one or two locations. If not, it may be a feature or series idea instead.

From idea to premise

A premise is the dramatic situation at the heart of a story: who wants what, and what stands in the way. Writers often test a premise with a set of questions. Who is the protagonist? What do they want, and why now? What stops them? What happens if they fail? Why is this story worth telling? If you cannot answer these, the idea needs more work.

The stronger answers are specific, visual and full of conflict. Note that conflict does not need villains. Nadia faces a dilemma between two good things, which is often more interesting than a fight between good and evil.

The logline

A logline compresses a story into one or two sentences. Producers, agents and funders ask for loglines because they reveal quickly whether a story has a clear protagonist, goal and conflict. A good logline usually contains a specific protagonist described with an adjective or role, an inciting situation, a goal and an obstacle or stakes, and it hints at genre and tone.

Here is an original example: "When a timid night-shift nurse discovers that a dying patient is the man who wrongly convicted her father, she must decide before dawn whether to tell him who she is." It has a protagonist (a timid night-shift nurse), an inciting incident (discovering who the patient is), a goal or dilemma (whether to tell him) and a ticking clock (before dawn). It also suggests a quiet drama rather than a thriller.

• Use active verbs: discovers, must decide, fights, escapes.
• Make the protagonist specific but not named; "a retired ferry captain" tells us more than "Bill".
• Show the conflict; a logline without an obstacle describes a situation, not a story.
• Keep it under about 35 words.
• Avoid the ending; a logline sells the question, not the answer.

Testing loglines with numbers

Writers sometimes score loglines against a simple checklist to compare versions. The scores are not science, but they make weaknesses visible.

Theme: what the story is about underneath

If the premise is what happens, the theme is what the story means. Theme is the idea or question the story explores, such as whether loyalty to family can excuse dishonesty, or what we owe the people who raised us. Strong themes usually come out of the character's choices rather than being stated in dialogue. If a character announces the moral, audiences feel lectured. If the character makes a hard choice that embodies the theme, audiences feel it.

Many writers find their theme during drafting rather than before. A useful exercise is to state the theme as a question rather than an answer: "Is it ever right to break a promise?" A question keeps the story open and lets different characters embody different answers. A supporting character might argue that promises are sacred; another might break them casually; the protagonist must find a position by the end.

• Express theme as a question, not a slogan.
• Give different characters different answers to the question.
• Test every scene: does it connect, however indirectly, to the theme?
• Let the climax force the protagonist to answer the question through action.

Genre, tone and audience

Genre sets audience expectations: a horror film promises fear, a romantic comedy promises a relationship and laughter, a thriller promises suspense. Tone is the emotional colour of the telling: dark, warm, satirical, melancholy. Knowing your genre and tone early shapes every decision, from the opening image to the dialogue. Mixing genres can be powerful, but a mix that is not controlled feels confused. Audience matters too. A short for children's festivals, a horror short for genre festivals and an art-house drama for a cinémathèque need different approaches.

Originality and ethics

Every writer borrows, but there is a line between influence and copying. Ideas themselves are not protected by copyright, but specific expression, such as dialogue, detailed scenes and characters, is. Lesson 12 covers this in detail. Ethically, be careful when writing about real people and communities you do not belong to. Research, consult and ask whose story it is to tell. Authenticity is not just a moral question; audiences and funders notice when a story's world rings false.

Canadian funders and broadcasters increasingly ask how projects about Indigenous communities involve Indigenous creators, following protocols such as the On-Screen Protocols and Pathways guide developed by the Indigenous Screen Office.

Pitching your idea

A pitch is a spoken presentation of a story, usually short. In a two-minute pitch you might give the title, logline, genre and tone, introduce the protagonist, describe the beginning, the main conflict and how it escalates, and suggest why it matters to you and to an audience. Practise until it sounds natural. A pitch is also a test: if listeners lean in, the idea has energy; if they look puzzled, the story may not be clear yet.

Working title and first impressions

A working title is part of a script's first impression. A strong title suggests genre, tone and the central idea in a few words, and it makes a logline easier to remember. Avoid titles that are generic, such as "The Journey," or that give away the twist. Many writers keep a list of possible titles and test them on friends alongside the logline. A title can change many times before release, but a good working title helps readers picture the film from the first page.