Darkness is not only the mere absence of light, but it also represents the unknown, secrets and lack of knowledge. In detective fiction, the investigator ventures into this darkness to uncover hidden truths. He brings mysteries to light, making the unknown understandable. Darkness in the sense of dark deeds such as murder, theft and corruption creates the settings where detective characters are needed—so the investigator confronts multiple shades of darkness in a variety of shady places. The popularity of detective fiction is closely tied to the Victorian era. Iconic figures like Sherlock Holmes and Inspector Bucket solve crimes, protect society and enlighten both their clients and readers. Analysing those depictions of light and darkness in Victorian detective stories with the method of close reading shows interesting insights of the many remarkable facets of darkness, particularly how and where they are depicted within several techniques in narrative texts. Deciphering these facets of darkness, it becomes clearer how the complex portrayals of investigators with the unique talent of being able to see what no one else can see illuminate Victorian darknesses and how they act as a source of light in aid for others to see more clearly.