A chance midnight encounter between a drawing master and a mysterious woman dressed entirely in white initiates a complex web of deception and peril. Walter Hartright finds himself entangled in a conspiracy involving identity theft, forced confinement, and international criminal machinations. He must navigate the rigid social structures of Victorian England while attempting to protect the women he loves from the predatory schemes of Count Fosco and Sir Percival Glyde. The narrative employs a multi-perspective framework, utilizing various testimonies and documents to reconstruct the events surrounding the central mystery.

Readers and critics frequently identify this work as the definitive example of the Sensation Novel genre. Discussion often centers on the psychological depth of the antagonist, Count Fosco, and the unconventional strength of the character Marion Halcombe. Many observers highlight the effectiveness of the multi-narrator structure in building suspense and maintaining a sense of uncertainty throughout the plot. The balance between domestic drama and criminal intrigue remains a frequent point of analysis for those examining Victorian literary techniques. Readers often note that the pacing remains consistent despite the length of the narrative, providing a clear view of the author's skill in managing complex plot threads.