Set in 1957 New York City, the narrative follows Lionel Essrog, a lonely private investigator afflicted with Tourette’s syndrome and severe obsessive-compulsive behaviors. Lionel works for a small-time
detective agency run by Frank Minna, who rescued Lionel and three other orphans from a brutal Catholic institution, employing them as operatives whom Lionel affectionately terms his "orphan boys."The plot kicks into gear when Frank is brutally murdered after taking on a mysterious, dangerous case involving a young woman named Laura Rose. Devastated and desperate for closure, Lionel takes it upon himself to solve Frank’s murder. Armed only with his sharp intellect, meticulous memory, and a compulsion to follow clues to their bitter end, Lionel begins retracing Frank's final steps.His investigation leads him from a sweaty, underground Harlem jazz club filled with soulful trumpet music to the tense, racially charged neighborhoods of Brooklyn. Lionel discovers that Frank had been blackmailing powerful city officials on behalf of Laura, who was unwittingly stumbling onto a massive urban displacement scheme orchestrated by Moses Randolph, a ruthless, tyrannical city planning commissioner reminiscent of Robert Moses. Randolph is systematically destroying lower-income neighborhoods under the guise of civic progress, forcibly evicting residents and seizing property with the help of corrupt city officials and the mayor.As Lionel dives deeper, he forms an uneasy alliance with Laura and uncovers a web of
political corruption, familial betrayal, and murder. He realizes that Frank’s investigation threatened to expose Randolph’s entire empire. Along the way, Lionel faces intense prejudice and alienation due to his neurological condition, yet his unique traits ultimately help him piece together the puzzle that others overlook.The dramatic climax unfolds at a sprawling housing development gala, where Lionel confronts Randolph and exposes the full extent of the commissioner's crimes, including the murder of Frank Minna, who had tried to protect Laura from Randolph’s henchmen. Randolph attempts to intimidate Lionel, believing society will dismiss a man with Tourette’s as an unreliable madman. However, Lionel stands firm, armed with undeniable evidence and unyielding moral courage.In the aftermath, while Randolph manages to evade immediate total ruin due to his immense political power, the corruption is dragged into the harsh light of public scrutiny. The film concludes on a bittersweet, poignant note. Lionel, having found a sense of agency, closure, and self-acceptance that had eluded him his entire life, leaves the chaotic city behind. He retreats to a quiet, peaceful upstate sanctuary gifted by Laura, finally finding a semblance of rest and belonging after avenging the only father figure he ever knew.