Plot Analysis Summary
A threatened mansion becomes a maze of disguises, false supernatural signs, hidden rooms, and competing investigations.
Story Structure — 5 Plot Phases
The Emerald Warning
Gideon receives a threat predicting the theft of the Favre emeralds, but the warning becomes reality when the Bat murders him and escapes. The criminal then moves toward the mansion.
Key Events
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Emerald Theft Warning — Gideon receives a letter predicting a midnight emerald robbery by the Bat. Characters: Gideon Bell
Location: Favre Emeralds premises
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Gideon Is Murdered — The Bat murders Gideon and steals the emeralds before leaving a warning for police. Characters: Gideon Bell
Location: Favre Emeralds premises
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Arrival At The Mansion — The Bat travels by car toward the mansion rented by Cornelia for the summer. Characters: Cornelia Van Gorder, Lizzie Allen
Location: Fleming mansion
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Bear Trap Prepared — Lizzie sets a bear trap in preparation for the Bat's expected arrival. Characters: Cornelia Van Gorder, Lizzie Allen
Location: Mansion entrance
Suspicion At The Mansion
Cornelia and Lizzie prepare the mansion against the Bat while Richard and Wells pursue their leasing scheme. The bank robbery report and Dale's arrival introduce new identities and suspicions.
Key Events
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Leasing Scheme — Richard and Wells plan to frighten Cornelia away so Richard can lease the mansion. Characters: Richard Fleming, Dr. Wells, Cornelia Van Gorder
Location: Mansion
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Bank Robbery Report — A newspaper reports that bank cashier Brooks Bailey has stolen $200,000 and disappeared. Characters: Brooks Bailey, Cornelia Van Gorder
Location: Mansion
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Dale Arrives Disguised — Dale arrives with a supposed new gardener, adding another uncertain identity to the household. Characters: Dale Ogden, Cornelia Van Gorder, Lizzie Allen
Location: Mansion grounds
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Botanical Test — Cornelia tests the gardener with medical terms, but he answers as if they describe plants. Characters: Cornelia Van Gorder, Dale Ogden
Location: Mansion
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Richard Is Shot — Richard is shot on the staircase, and Dale takes part of a house blueprint from his pocket. Characters: Richard Fleming, Dale Ogden
Location: Mansion staircase
Blueprints And False Shadows
Richard is shot, Dale becomes connected to a missing blueprint, and strange calls and shadows create panic. Several apparent supernatural events receive misleading or ordinary explanations.
Key Events
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Richard Is Shot — Richard is shot on the staircase, and Dale takes part of a house blueprint from his pocket. Characters: Richard Fleming, Dale Ogden
Location: Mansion staircase
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Blueprint Accusation — Moletti accuses Dale of searching for a hidden room shown on the blueprint. Characters: Dale Ogden, Detective Moletti, Cornelia Van Gorder
Location: Mansion
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False Bat Apparition — A distress call and bat shadow alarm the group, but a moth causes the apparent supernatural image. Characters: Cornelia Van Gorder, Lizzie Allen, Detective Anderson
Location: Garage and mansion wall
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Murder Reenactment — Wells asks Dale to recreate Richard's shooting, revealing that the blueprint was hidden in a roll and then vanished. Characters: Dr. Wells, Dale Ogden, Richard Fleming
Location: Mansion
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Gardener Identity Exposed — The gardener is revealed as Brooks, and Anderson moves to arrest him for robbery, murder, and impersonation. Characters: Brooks Bailey, Dale Ogden, Detective Anderson
Location: Mansion
The Hidden Room
Brooks's identity is exposed, but Dale protects him by revealing their engagement. The house search continues through the ballroom and hidden passages while Wells and Moletti clash.
Key Events
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Engagement Revealed — Dale stops Brooks's arrest by revealing that she and Brooks are engaged. Characters: Brooks Bailey, Dale Ogden, Detective Anderson
Location: Mansion
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Hidden Room Search — Wells knocks on walls while searching for the hidden room, drawing the household toward the ballroom. Characters: Dr. Wells, Cornelia Van Gorder, Lizzie Allen
Location: Mansion walls
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Haunted Ballroom Trick — Candles go out and a floating shape approaches Anderson and Lizzie, but the image has a mundane explanation. Characters: Detective Anderson, Lizzie Allen, Cornelia Van Gorder
Location: Ballroom
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Moletti Is Knocked Out — Wells strikes Moletti unconscious after a confrontation and hides him in another room. Characters: Dr. Wells, Detective Moletti
Location: Mansion
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Hat-Wearing Figure — A mysterious figure crosses the roof while the Bat prepares wires connected to the light switch. Characters: Brooks Bailey, Detective Anderson, Lizzie Allen
Location: Mansion and roof
The Mask Falls
Dale finds the hidden room and is confronted for the safe combination. The Bat escapes through darkness, is caught in Lizzie's trap, and is exposed through a false identity.
Key Events
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Hat-Wearing Figure — A mysterious figure crosses the roof while the Bat prepares wires connected to the light switch. Characters: Brooks Bailey, Detective Anderson, Lizzie Allen
Location: Mansion and roof
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Hidden Room Found — Dale discovers the hidden room behind a fireplace, where the safe is located. Characters: Dale Ogden, Brooks Bailey
Location: Mansion fireplace
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Safe Combination Demanded — The Bat confronts Dale and demands the combination to the safe, but she escapes. Characters: Dale Ogden
Location: Hidden room
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Bat Escapes Darkness — The Bat is held at gunpoint but activates the wire system, extinguishes the lights, and escapes. Characters: Dr. Wells, Detective Anderson, Dale Ogden
Location: Mansion
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Mask Removed — The fleeing Bat is caught in Lizzie's bear trap, and the group removes the mask to reveal Moletti. Characters: Lizzie Allen, Cornelia Van Gorder, Detective Anderson, Detective Moletti
Location: Mansion grounds
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True Moletti Appears — The beaten man identifies himself as the true Moletti and explains that his papers were stolen and he was imprisoned. Characters: Detective Moletti, Detective Anderson, Cornelia Van Gorder
Location: Mansion