Sleeping Dogs focuses on a police officer attempting to bring down criminal factions. The game takes place in Hong Kong with players assuming control of Detective Wei Shen, an officer of the Triad Bureau of Hong Kong Police. Wei has returned to Hong Kong after spending most of his life in the United States. Wei has been assigned to go undercover and infiltrate the Triad organization called Sun On Yee. The plot focus on the moral struggle of Wei to stay true to his mission and stop the Triads while maintaining his cover and being as much like the criminals as possible.