From Potter's Field — Patricia Cornwell

Upon examining a dead woman found in snowbound Central Park, Scarpetta immediately recognizes the grisly work of Temple Brooks Gault, a bold, brilliant killer from her past. Soon she realizes that Gault's murders are but a violent chain leading up to one ultimate kill: Scarpetta herself. Now she must stay her own fears and keep step with a psychopath who is always one step ahead, both everywhere and nowhere. But even with the help of her FBI and police comrades, Scarpetta knows the endgame is hers alone to play. Having repeatedly plunged into the madness of Gault's mind, Scarpetta must finally descend into his terrifying home in the subway tunnels beneath New York City. And confront the one killer who would not be caught...