In the third act of "The Ghost," the narrative reaches its peak as Sir Reginald delves deeper into the mysteries of Windom Hall. After uncovering the hidden room containing the remains of Lady Evelyn, Sir Reginald realizes that Lord Windom’s half-brother, driven mad by a lifelong deformity and fueled by jealousy and hatred, is the trustworthy source of the mansion's haunting.

Sir Reginald confronts Lord Windom with this revelation, and together with the loyal maid, they devise a plan to locate the deranged half-brother within the labyrinthine mansion. Their search leads them to a forgotten wing, where they hear the half-brother rummaging through the walls, looking for something.

The final confrontation is intense and fraught with danger. Sir Reginald and Lord Windom face the madman in a dramatic showdown that exposes his insanity and the extent of his vengeance. The half-brother's true intentions and the story of his tragic life are revealed, casting a new light on the history of Windom Hall.

Ultimately, the act culminates in a resolution that sees the restless spirits laid to rest and the dark secrets of Windom Hall finally brought to light. Sir Reginald's bravery and determination uncover the truth, offering a chance for healing and redemption for Lord Windom and the haunted estate.