Dead of Darkness is a survival-horror action-adventure game set in 1985 England, where players take on the role of private investigator Miles Windham. Following a lead on his daughter's mysterious death, Windham travels to Velvet Island, only to find himself amidst strange behavior from the island's residents. As hostility escalates, players must navigate a complex narrative filled with over 15 unique characters, each harboring dark secrets connected to the island. The game uniquely blends elements of cosmic horror, creating an intense atmosphere that keeps players on edge.

The gameplay is characterized by challenging survival mechanics, where resources are scarce and inventory space is limited. Players must carefully plan their routes to survive encounters with 13 relentless enemies, each capable of pursuing Windham with lethal intent. As the tension rises, players experience intense hallucinations that blur the lines between reality and fiction, adding another layer of complexity to the game. By investigating the environment and uncovering clues, players can unlock hidden troves and secret passageways, enhancing the detective experience in this gripping adventure.