Sybil Lansdown

Dick Martin

Dick Martin and Sybil Lansdown share a romantic connection, with Martin acting as her protector and love interest.

Mrs. Bertram Cody

Mrs. Bertram Cody is likely Sybil Lansdown's mother or close maternal figure, showing concern for her.

Bertram Cody

Bertram Cody is Sybil Lansdown's father, with a protective but possibly strained relationship.

Mr. Havelock

Mr. Havelock interacts with Sybil Lansdown as part of the investigation, showing protective concern.

Dick Martin

Dick Martin and Sybil Lansdown share a romantic connection, with Martin acting as her protector and love interest.

Dick Martin

Dick Martin and Sybil Lansdown share a romantic connection, with Martin acting as her protector and love interest.

Mrs. Bertram Cody

Mrs. Bertram Cody is likely Sybil Lansdown's mother or close maternal figure, showing concern for her.

Bertram Cody

Bertram Cody is Sybil Lansdown's father, with a protective but possibly strained relationship.

Bertram Cody

Bertram Cody is Sybil Lansdown's father, with a protective but possibly strained relationship.

Mr. Havelock

Mr. Havelock interacts with Sybil Lansdown as part of the investigation, showing protective concern.

Mrs. Bertram Cody

Mrs. Bertram Cody is likely Sybil Lansdown's mother or close maternal figure, showing concern for her.

Mr. Havelock

Mr. Havelock interacts with Sybil Lansdown as part of the investigation, showing protective concern.

The Door with Seven Locks

Accompanies Dick Martin in discovering the hidden door and passage.

II

The capable and observant librarian at the Bellingham Library; she is amused by Dick and hides her name from him.

IV

Meets Dick at the library; deduces his mission and reveals her distant relation to Lord Selford.

VI

Travels to Madeira to retrieve a mysterious key left by Silva, encounters Dick Martin on the voyage, and is targeted by thieves.

IX

Recalled by Dick when he touches the notebook; her key is compared to the one he found.

XII

Defends Dick to her mother, shows growing trust and interest in him, learns the key was not lost.

XIV

Calls Dick, arranges the trip to Selford Hall, and is frightened by the storm and the discovery.

XV

Accompanies Dick and Havelock to the tombs, is distressed by the shooting, and later apologizes to Havelock for the unpleasant adventure.

XVII

Struggles with her feelings about Dick Martin and receives a mysterious visit from Mrs. Bertram Cody, who warns of enemies and invites her to tea.

XVIII

Lured to Weald House, becomes suspicious of Mr. Cody's lies, attempts to leave but is drugged and collapses.

XIX

Imprisoned by Cody, drugged, and later locked in a spare bedroom; she struggles to escape and suspects the key is connected to her detention.

XX

She is absent from home, having left the library with an unknown woman in a Rolls-Royce, causing Martin concern.

XXI

Mentioned as having been brought to the house by Mrs. Cody; her bloodstained handkerchief is found in an attic room, indicating she was held there.

XXIV

Rescued by Cawler; flees through the park and hides in the Selford tombs.

XXV

Flees from a pursuer, encounters Stalletti in the tomb, escapes his hypnotic control, finds a dog, sees a strange man in Selford Manor, and meets Dick Martin.

XXVI

Exhausted and shaken after her night's adventure; reports seeing a strange man in the house; agrees to stay at the Manor despite her fatigue.

XXVII

Sleeping at Weald House; her mother arrives and reports she is safe.

XXVIII

Learns from Dick that she is the heiress-at-law if Lord Selford dies; expresses fear of Stalletti.

The Arrest and the Fire

Mentioned as having been sent to London earlier for safety.

XXXIII

Learns she is the heiress to Lord Selford's fortune and shares an intimate conversation with Dick.