Screenplay Structure Analysis

Insidious

Written by Leigh Whannell · Supernatural Horror · 108 pages · 155 scenes · 3-act natural structure · linear organization · Analysis confidence: High

When their son Dalton falls into an unexplained coma, the Lambert family discovers he is not in a coma at all—his spirit has traveled too far into an astral realm called The Further, attracting malevolent entities that now haunt their home and threaten to possess his body.

Tone
Escalating dread with domestic realism giving way to nightmarish supernatural terror; intimate family drama colliding with cosmic horror

Tension curve

Dramatic intensity across Insidious from first page to last, sampled at 40 points on a 0–10 scale. Values: 2.9, 3, 3.5, 3.7, 4.4, 5, 5.8, 6, 6, 6.6, 7, 6.9, 6.6, 6.6, 6.9, 6.7, 6.5, 6.3, 5.6, 5.5, 6.1, 7.6, 8.4, 7.4, 6.1, 5, 5.6, 6.1, 6.9, 6.9, 6.9, 6.7, 7.3, 7.8, 8.4, 8.4, 8.5, 8.7, 9, 9.3.

Structure at a glance

Inciting incident
Page 21, 19% of the script: Josh tries to wake Dalton by knocking, nudging, and shaking him vigorously, but Dalton remains completely unresponsive and slack like a puppet.
Act 1 break
Page 22, 20% of the script: Dalton falls into an unexplained coma after his basement accident, transforming the story from domestic setup into supernatural mystery.
Midpoint
Page 51, 47% of the script: Lorraine screams when she sees a diabolical red-faced figure with a bald head and charcoal black skin crouched behind the couch staring at her; she tells Josh 'He's here' while frozen in terror.
Act 2 break
Page 56, 52% of the script: Elise arrives and reveals the truth about astral projection and The Further, shifting from haunted house investigation to active rescue mission.
Climax
Page 100, 93% of the script: Creeping souls who crawled from drawers march toward Josh's body as Elise leans into his face urging him to wake up while the closest entity reaches out with gnarled fingers.
Peak tension
9.3 out of 10, reached about 100% of the way through; the script averages 6.5.
Average scene length
1.2 pages

Structural personality

This script employs a classic three-act structure but subverts the haunted house genre by revealing the house isn't haunted—the boy is. Act One (scenes 1-35) establishes domestic normalcy that slowly curdles, culminating in Dalton's coma. Act Two (scenes 36-92) is the longest section, spanning the family's two-month ordeal, their move to a new house, and the escalating paranormal activity that proves the haunting follows them. The act break at scene 92 is crucial: Elise's arrival doesn't just introduce an expert—it reframes the entire narrative, revealing Josh's suppressed childhood ability and establishing the astral projection mythology. Act Three (scenes 93-155) is a tightly compressed rescue mission into The Further, followed by a devastating twist ending. The structure mirrors the story's central conceit: what appears to be one thing (a coma, a haunted house) is revealed to be something far more personal and terrifying.

Pacing

The script's pacing is deliberately deceptive. Act One moves briskly through domestic chaos (scenes 5-11 establish the family in rapid-fire breakfast sequences) before the basement fall at scene 14 and the devastating time jump to scene 35. Act Two employs slow-burn dread: the two-month coma period (scenes 36-69) uses repetition and domestic erosion to build suffocating tension. The move to the new house (scene 70) briefly suggests relief before paranormal activity intensifies (scenes 82-98). Elise's séance sequence (scenes 92-109) is the script's structural hinge—a long, methodical explanation that recontextualizes everything. Act Three accelerates dramatically: the astral projection sequence (scenes 110-144) cross-cuts between The Further and the real world with mounting urgency, then the climax and twist (scenes 145-155) hit in rapid succession. The final 10 pages move at breakneck speed, earning the abrupt, chilling ending.

Themes

Similar shapes

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Scene summaries and structural markers are generated by AI analysis of the screenplay text and may contain minor inaccuracies. ScriptGraph analyzes structure and does not reproduce screenplay text.

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