Nicholas Thornhill, one of the wealthiest and most intelligent men in Gotham City, is found dead on his doorstep, seemingly plummeting to his death from several stories above. Batman arrives at the crime scene and finds Pamela Isley, a.k.a. Poison Ivy, amongst the crowd. Suspicion begins to arouse with the Gotham police force and Batman that Isley is behind Thornhill's death. As the plot thickens, friends become enemies and corruption in the Gotham police force runs deeper than ever, and Isley is placed in more danger than she ever thought possible.