The story opens on a grim scene during the American Civil War. A civilian stands on a railroad bridge in northern Alabama, his wrists bound behind him and a noose fitted around his neck. Federal soldiers surround him in rigid formation, their rifles at the ready, while a captain and a sergeant oversee the execution. Below the bridge, the Owl Creek churns with swift, dark water. The condemned man gazes down at the current and notices a piece of driftwood spinning lazily in the eddies. His perception of time begins to fracture. The ticking of his watch seems to slow into enormous, thunderous beats separated by eternities of silence. Every sensory detail — the light on the water, the texture of the rope, the distant call of insects along the bank — registers with an almost unbearable sharpness, as though his mind is desperately cataloging the world it is about to leave.
The narrative then steps backward in time to explain how this man arrived at the bridge. He is Peyton Farquhar, a prosperous Alabama planter and an ardent supporter of the Confederate cause. Though circumstances have prevented him from joining the Southern army, Farquhar burns with a romantic desire to perform some act of daring service for the rebellion. One evening, a gray-clad soldier rides up to the Farquhar plantation and mentions, in seemingly casual conversation, that Federal troops have occupied the Owl Creek railroad bridge and are preparing it for further advance. The soldier notes that any civilian caught interfering with the railroad infrastructure will be hanged without trial. He also lets slip that the bridge is lightly guarded and that dry driftwood piled against its timbers could be easily set ablaze. Farquhar seizes on this information eagerly, his imagination already racing toward sabotage. Only after the soldier departs does the reader learn the devastating truth: the visitor was not a Confederate at all but a Federal scout in disguise, deliberately planting the idea to lure Farquhar into a fatal trap.
The third and longest section returns to the bridge at the instant of execution. The sergeant steps aside, the plank tips, and Farquhar plunges downward. But then something extraordinary seems to happen. The rope snaps. Farquhar drops into the roiling creek and, after a moment of suffocating darkness, fights his way to the surface. His senses erupt into overwhelming vividness. He can distinguish individual leaves on the trees along the bank, see the veins running through them, observe a spider spinning its web, and even note the prismatic colors in the dewdrops on the grass. The soldiers open fire from the bridge, and musket balls hiss into the water around him. A cannon is brought to bear, sending a plume of spray skyward. Farquhar dives deep, lets the current carry him, and surfaces again downstream, beyond the range of the guns.
He drags himself ashore and stumbles into a vast, seemingly pathless forest. The landscape takes on a strange, dreamlike quality. The trees form perfect geometric corridors. The stars overhead arrange themselves in unfamiliar constellations and seem to whisper in an alien tongue. His neck aches terribly and his tongue is swollen with thirst, yet he presses on through the night, driven by the thought of his wife and children waiting at home. By morning he finds himself on a familiar road. The trees arch overhead like a golden canopy, and everything glows with an unearthly beauty. At last he reaches the gate of his own property. His wife stands on the veranda, radiant, her arms outstretched to welcome him. He rushes toward her with a cry of joy.
Then, in a single devastating sentence, the illusion collapses. A blinding white light explodes around him, followed by a sound like the shock of a cannon. Darkness and silence swallow everything. Peyton Farquhar is dead. His body swings gently from a timber beneath the Owl Creek bridge, his neck broken by the fall. The entire elaborate escape — the snapping rope, the superhuman swim, the agonizing trek through the forest, the joyful homecoming — existed only in the fraction of a second between the drop and the fatal jerk of the noose. What felt like hours of desperate flight was nothing more than the last electrical firing of a dying brain, a final hallucination conjured by a consciousness unwilling to accept its own extinction.