Spots 
Beatrice Darryll surrenders her freedom to save her father, Sir Charles, from imminent imprisonment over fraudulent city dealings. Her forced engagement to the sinister millionaire Stephen Richford cuts short her devotion to Mark Ventmore. A secretive woman clad in grey interrupts the eve of the wedding, introducing a cryptic threat into the family's precarious bargain.
CHAPTER I → CHAPTER V
Sir Charles Darryll perishes unexpectedly just as the marriage ceremony to Stephen Richford halts midway. Searching her deceased father's suite, Beatrice uncovers a cryptic note linked to the mysterious grey lady known as Mrs. Beacon Light. The official demand for an inquest unnerves Richford, leaving Beatrice clinging to the hope that her incomplete nuptials remain legally void.
CHAPTER VI → CHAPTER X
Inspector Field discovers the locked bedroom sealed by police has been brazenly stripped of Sir Charles's corpse. Mark Ventmore and Beatrice deduce that the self-styled Countess de la Moray took wax impressions of the door seals during a brief intrusion. Beatrice identifies her putative husband, Stephen Richford, conspiring alongside these aristocratic impostors, deepening the conspiracy surrounding the missing body.
CHAPTER XI → CHAPTER XV
Carl Sartoris commands a network of conspirators, utilizing the disgraced surgeon Dr. Bentwood to execute complex schemes. Inside a concealed house in Wandsworth, the gang transports the swathed body of Sir Charles for illicit manipulation. Colonel Berrington confronts the tragic grey lady, Mary Sartoris, discovering her agonizing connection to the villainous mastermind orchestrating the plot.
CHAPTER XVI → CHAPTER XX
Colonel Berrington breaches the inner lair only to be overwhelmed by the combined force of Sartoris's accomplices. When Berrington reaches for the hidden body, Sartoris activates concealed machinery that reverses the dining room floor, instantly vanishing all evidence. An electrified door mechanism traps Berrington, subjecting him to agonising shock when he attempts to break free.
CHAPTER XXI → CHAPTER XXV
Stephen Richford disguises himself as a clergyman to stalk Beatrice and reclaim a fortune in diamonds. Overhearing his plot in a quiet restaurant, Mary Sartoris discovers that Richford has allied with Reggie and Cora to ambush Beatrice on her way to Wandsworth. Inspector Field connects the enterprise to an old Burmese mining venture involving Sir Charles and his ward, Violet Decié.
CHAPTER XXVI → CHAPTER XXX
Colonel Berrington bypasses Sartoris's defenses to examine the floor mechanism in the dining room. Lowering himself into a concealed subterranean brick vault, he discovers a discarded shirt collar bearing the personal mark of Sir Charles Darryll. This tangible clue proves the deceased baronet was physically brought through the house, verifying the elaborate machinery used to stage the disappearance.
CHAPTER XXXI → CHAPTER XXXV
Beatrice stands firm against Sartoris and his confederates when they demand her diamond stash. Colonel Berrington intervenes, presenting the crucial collar clue before Beatrice accidentally disables Sartoris by firing a stray bullet into his mechanical chair. Inspector Field and armed police raid the hall, apprehending the entire ring and exposing their fraudulent Burmese land claims.
CHAPTER XXXVI → CHAPTER XL
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E. Phillips Oppenheim's Novels
A classic British mystery unraveling forced marriage, missing bodies, secret vaults, and high-society intrigue.