What does in medias res mean?

In medias res is Latin for "into the middle of things." It describes an opening that starts in full action or crisis rather than at the chronological beginning of the story, with context and backstory filled in afterward.

What is an example of a story starting in medias res?

The Iliad opens in the tenth year of the Trojan War, not at its origin — Homer's original use of the technique. Breaking Bad's pilot opens on Walter White in his underwear in the desert, ambulance sirens in the distance, well into the crisis.

What's the difference between in medias res and a flashback structure?

In medias res is about where the story starts (mid-action), not how it's told afterward. A flashback structure explicitly rewinds to an earlier scene; an in medias res opening can simply move forward from the action point, distilling backstory in passing without ever formally flashing back.

In medias res | SagaScope

Definition

The phrase comes from Horace's Ars Poetica, praising Homer for opening the Iliad in the heart of the war, not at its origin. Today, in medias res covers two uses: opening in the middle of the main action (a strong sequence later revisited) or opening in the middle of an intense scene whose context is reconstructed in subsequent pages.

What it's for

It creates a strong hook and forces the reader to reconstruct context. It suits high-suspense stories, provided delayed exposition is dosed so the reader doesn't stay disoriented too long. In medias res is also a powerful tone-promise tool: page one contracts the genre and the tempo.

Variants by genre

Crime / thriller: open on the body, the chase, or the attack, then loop back to the hours before.
Fantasy / SF: open on an action scene that demonstrates a rule of the world rather than a worldbuilding prologue.
Literary: open in medias res in mid-dialogue / mid-emotion, with no time-frame.
Romance: open mid-breakup, mid-wedding, mid-crisis, then return to the couple's origin.
Horror: open on the effect (corpse, scream, final scene), then return to early innocence.
YA / coming-of-age: open on an identity crisis point, then unfold "how we got here".
Series: open a new volume in medias res after an ellipsis to re-launch.

Common pitfalls

Confusing in medias res with systematic flashback structure: an in medias res opening doesn't require an explicit rewind.
Over-explaining too soon out of caution, killing the effect (often at chapter 2).
Opening on action with no identifiable stake: the reader doesn't know whom to worry for.
Opening so strong that no other scene can top it ("the first page was my climax").
Pivoting abruptly to 50 pages of exposition at chapter 2 — cancels the tempo promise.

Examples

The Iliad — Homer opens in the tenth year of the war, not at its origin.
Gone Girl — Amy's disappearance opens the novel; the couple's history is back-lit.
Breaking Bad (pilot) — Walter in his underwear in the desert, ambulance in the distance: iconic in medias res.
Mauvais Sang (Carax) — opens in medias res mid-flight, refuses to explain.
Saving Private Ryan — Omaha Beach as first sequence, the "why" distilled after.
Annihilation (VanderMeer) — the expedition has already entered Area X.
The Road (McCarthy) — the world has already burned, we never learn how or why.
The Seven Husbands of Evelyn Hugo (Reid) — opens on the present-day interview, the real life in flashback.

Writing tips

Pick a stake readable in three lines: the reader must grasp who wants what and what they risk on page one, even without context.
Distill delayed exposition across the first 30 pages, never in a chapter 2 lump: two or three fragments per scene, via dialogue or thought, are enough.
Rewrite chapter 1 as if it were chapter 5: cut everything before the first true dramatic move. What you delete must resurface later, transformed.
Bring the opening scene back at least once: at the climax, it should read differently. Otherwise it's a marketing hook, not a structural device.

Go deeper: How to hook readers on the first page and Captivating chapter openings — examples.

Revision checklist

Does the opening scene promise the book's tone and genre (tempo, stake, voice)?
Does delayed exposition arrive in dosed fragments, not as an explanatory block?
Can the reader grasp the stake of the opening scene without knowing its context?
Does the opening scene return later, transformed by what we have learned?

In medias res