In a grim, rain-soaked city, Detective Lieutenant William Somerset, a world-weary but intelligent and dedicated homicide detective on the brink of retirement, partners with his soon-to-be replacement, the brash and impulsive Detective David Mills. The pair are assigned to a perplexing case when they discover a series of grotesque murders reflecting the seven deadly sins: gluttony, greed, sloth, lust, pride, envy, and wrath. The first murder involves an obese man who is forced to eat until his stomach bursts, representing gluttony, which sets the dark, unsettling tone for the investigation.

As Somerset and Mills delve deeper into the case, they are drawn into the twisted logic of the killer, whose meticulous planning and deranged moral mission leave a trail of meticulously staged crime scenes. The detectives find themselves in a race against time to decipher the clues and prevent further atrocities. Their pursuit becomes a descent into the shadowy recesses of the human psyche, confronting their own personal demons along the way. The killer’s methodical approach and symbolic targets intend to punish the sinners and make a statement about the decay of modern society.