Story Structure — 5 Plot Phases
The Forbidden Release
A spirit board gathering allows the Grim to possess Katie and obtain verbal permission to escape its subterranean prison. The creature's release begins a series of attacks and disappearances.
Key Events
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Spirit Board Gathering — Katie, Steve, Trish, and Sarah gather to use a spirit board. Characters: Katie, Steve, Trish, Sarah
Location: A house in Woodland Hills
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Katie Becomes Possessed — The Grim possesses Katie during the supernatural encounter. Characters: Katie, Grim
Location: The spirit board gathering place
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The Grim Is Freed — The possessed Katie verbally grants the Grim freedom from its prison. Characters: Katie, Grim
Location: The spirit board gathering place
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Underground Animal Attacks — The freed Grim travels magically underground and attacks animals. Characters: Grim
Location: Cave systems beneath Woodland Hills
Sinkholes And Suspicions
The Grim's underground movements create sinkholes and lead to animal attacks and Mary's kidnapping. Katie and Steve reject the town's mining explanation and connect the events to the spirit board.
Key Events
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Mary Is Kidnapped — The Grim abducts Mary and takes her to its underground lair. Characters: Grim, Mary
Location: Woodland Hills
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Sinkholes Appear — The Grim's activity causes sinkholes across the town. Characters: Grim, Katie, Steve
Location: Woodland Hills
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The Friends Identify The Cause — Katie and Steve connect the sinkholes to the previous spirit board event. Characters: Katie, Steve
Location: Woodland Hills
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Rob Arrives In Town — Rob is dispatched because of his familiarity with the tunnels. Characters: Rob
Location: Woodland Hills
Into The Tunnels
Rob arrives because of his tunnel expertise and forms a crew with Penny, Katie, Steve, Trish, Ken, and Sarah. The expedition quickly becomes deadly when Trish and Steve are killed.
Key Events
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Spelunking Crew Forms — Rob organizes an improvised crew to investigate the underground tunnels. Characters: Rob, Penny, Steve, Katie, Trish, Ken, Sarah
Location: Woodland Hills
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Trish Is Slaughtered — The Grim attacks the crew and slaughters Trish in the tunnels. Characters: Grim, Trish
Location: Underground tunnels
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Search For Trish — The group searches the tunnels, initially unaware that Trish has died. Characters: Rob, Penny, Steve, Katie, Ken, Sarah
Location: Underground tunnels
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Steve Is Killed — The Grim kills Steve while the group searches for Trish. Characters: Grim, Steve, Katie, Rob, Penny
Location: Underground tunnels
The Captive Lair
The Grim abducts Ken and Sarah and takes them to its lair, where Mary is already captive and insane. Dynamite fails, and the rescue attempt becomes a desperate retreat complicated by Wendy's possession.
Key Events
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Ken And Sarah Abducted — The Grim abducts Ken and Sarah and takes them to its lair. Characters: Grim, Ken, Sarah
Location: Underground tunnels
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The Grim's Lair — Mary is held in the lair, while Ken and Sarah are brought there as captives. Characters: Grim, Mary, Ken, Sarah
Location: The Grim's underground lair
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Dynamite Fails — The rescuers attempt to kill the Grim with dynamite, but the attempt fails. Characters: Rob, Penny, Katie, Grim
Location: Underground tunnels
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Captives Are Rescued — Rob and the others rescue the captives but cannot safely evacuate everyone. Characters: Rob, Penny, Katie, Ken, Sarah, Mary, Grim
Location: The Grim's underground lair
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Wendy Is Left Behind — The group abandons Wendy because insanity and possession prevent her escape. Characters: Wendy, Grim, Rob, Penny, Katie
Location: The Grim's underground lair
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Ken Dies During Escape — The fleeing group is attacked by the Grim, and Ken is killed. Characters: Grim, Ken, Rob, Penny, Katie
Location: Underground tunnels
Sunlight In The Prison
After Ken dies during the escape, Rob discovers that bright light and sunlight can imprison the Grim again. The plan succeeds, but Katie is trapped with the creature, while Mary remains missing.
Key Events
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Ken Dies During Escape — The fleeing group is attacked by the Grim, and Ken is killed. Characters: Grim, Ken, Rob, Penny, Katie
Location: Underground tunnels
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Light Is The Weakness — Rob identifies the Grim's vulnerability to bright light and sunlight. Characters: Rob, Penny, Katie, Grim
Location: The Grim's prison chamber
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Flashlights Hold The Grim — Rob and Penny use flashlights to detain the Grim until sunlight reaches the chamber. Characters: Rob, Penny, Katie, Grim
Location: The Grim's prison chamber
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Sunlight Reimprisons The Grim — Sunlight reimprisons the Grim, but it grabs Katie and traps her with it. Characters: Grim, Katie, Rob, Penny
Location: The Grim's prison chamber
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Survivors Leave The Tunnel — Traumatized, Rob and Penny leave the tunnel after the confrontation. Characters: Rob, Penny
Location: Outside the tunnel
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Mary Remains Missing — Later, crews fail to find Mary, who remains in the Grim's lair. Characters: Mary, Grim
Location: The Grim's underground lair
A team of spelunkers, when investigating a system of caves beneath a small town, come across a hideous creature that can move through walls.