Paranoia

The novel opens with two retired NYPD detectives, Ralph Stein and Gary Halverson, bound to chairs in Ralph's rental house in Hollywood Beach, Florida. A professional killer rigs propane tanks with a timer and forces Gary to write a farewell email, staging the scene to look like a joint suicide. When the house detonates, Ralph's sister Rachel is walking nearby with her two young grandchildren; a chance encounter with a dog walker has delayed their approach, saving their lives.

In Manhattan, NYPD Detective Michael Bennett and his new partner, Rob Trilling, a quiet 24-year-old on temporary assignment to Manhattan North Homicide, attend the funeral of Lou Sanvos, a retired narcotics detective killed in a car accident. Unknown to them, the killer, Kevin Doyle, a former Green Beret turned contract assassin, sits anonymously in the church. A flashback reveals Doyle deliberately rammed Sanvos's car to cause the fatal crash.

At the post-funeral wake, Inspector Celeste Cantor, a decorated officer preparing to retire and run for New York City Council, pulls Bennett aside. She lists the recent deaths of several retired cops who were all former members of "the Land Sharks," a narcotics unit she once served on: Stein, Halverson, a detective named Tabitha Arnold, and Sanvos. Cantor asks Bennett to investigate quietly, reporting only to her. She frames the request as genuine concern but admits it could protect her political ambitions: If the deaths prove connected, she will look proactive for assigning a top detective. Bennett agrees but declines a formal reassignment.

Bennett's home life is soon in crisis. His wife, Mary Catherine, in the early first trimester after a difficult in vitro fertilization process, faints in their apartment. A doctor at Mount Sinai Hospital reports the pregnancy appears viable but orders strict bed rest. Bennett, who lost his first wife, Maeve, to cancer and adopted 10 children with her, is terrified. The children rally around Mary Catherine with caregiving schedules and meals.

Trilling's private life is also introduced. He lives in a small Queens apartment with five Pakistani women he rescued from a trafficking operation. Trilling struggles with loneliness and post-traumatic stress disorder (PTSD), quietly trying to wean himself off VA-prescribed sedatives.

Bennett begins reviewing case files with Walter Jackson, a criminal intelligence analyst renowned for his research skills. Walter discovers that several convicted drug dealers arrested by the Land Sharks have also died recently, in addition to the retired cops. The trail leads to Richard Deason, a Bronx drug lord convicted after an FBI wiretap and later murdered in prison. Bennett learns Deason had a wife, Isabel Vega, from a wealthy Panamanian family, and a son named Antonio, now in his mid-to-late 20s. One of Isabel's brothers, Gonzalo Vega, is a former military officer turned mercenary, raising the possibility he hired a killer on his nephew's behalf.

Doyle continues his contract killings. On Staten Island, he poses as an NYPD officer to enter the apartment of retired detective Roger Dzoriack, who drinks a glass of water laced with crushed pills. After staging the death as a suicide, Doyle kills a neighbor who saw him leaving and calls a contact named Amir to dispose of the body. When Bennett and Trilling investigate, Assistant Medical Examiner Aurora Jones flags suspicious details: The glass contained four different drugs though Dzoriack had a prescription for only one, and the fingerprints appear deliberately placed. Bennett grows certain these supposed suicides are murders.

Trilling and veteran detective Terri Hernandez conduct surveillance on a Bronx drug gang, using an informant named Jaime Nantes. They overhear a meeting with an outsider called "Little D" who speaks about wanting a quiet distribution network. Trilling suspects this is Antonio Deason. Bennett and Trilling visit Antonio at his SoHo apartment, but he refuses to speak.

Bennett flies to Florida on his own dime to investigate the Stein-Halverson deaths with Florida Department of Law Enforcement (FDLE) Special Agent Carol Frederick, confirming both men were well-liked and not suicide candidates. Back in New York, multiple surveillance attempts on Antonio fail due to sophisticated counter-surveillance that repeatedly outmaneuvers the detectives. Internal Affairs Detective Sergeant Dennis Wu also confronts Bennett after discovering he filed a Flying Armed form, the authorization required for an officer to carry a firearm on a commercial flight, for his Florida trip.

Desperate for a lead, Bennett and Trilling pressure Nantes into showing them documents at the gang's warehouse. The visit turns into a trap: Nantes calls out to his gang, and armed men disarm the detectives. Antonio Deason arrives and takes custody of them. Handcuffed and driven to a Midtown office, they expect the worst, but Deason produces a Drug Enforcement Administration (DEA) badge. He explains he joined the agency as a reaction against his father's destructive legacy and has been working undercover to infiltrate the drug gangs. The counter-surveillance that thwarted Bennett was conducted by DEA agents. With their primary suspect eliminated, the investigation returns to square one.

Bennett pivots to forensics. At Dzoriack's apartment, Trilling finds a thumbprint on the kitchen faucet that does not match the victim's prints. Walter forwards it to a Department of Defense contact, who returns a match: Kevin Doyle, a former Green Beret out of Fort Bragg.

A stakeout at the Bronx bodega where Nantes eats pays off. Bennett spots Doyle in a stolen SUV and boxes him in. In the ensuing chaos, the vehicle flips onto its side. After a fierce hand-to-hand fight between Trilling and Doyle, Bennett clotheslines the fleeing suspect and slams him to the ground. Doyle is arrested and transported to Manhattan North Homicide.

During interrogation, Doyle acknowledges killing retired cops but provides few details. Trilling, himself a former Army Ranger, bonds with Doyle over their shared military backgrounds. Doyle requests a Catholic priest; Bennett's grandfather, Seamus, a priest, administers confession and Communion privately. Bennett respects the seal of confession entirely, hoping the experience will motivate Doyle to cooperate.

The decisive breakthrough comes from Walter, who traces Doyle's family in Brooklyn and discovers his oldest cousin is Celeste Doyle, now Celeste Cantor. Bennett immediately understands: Cantor hired her cousin to kill everyone who could expose the Land Sharks' misdeeds and endanger her political future. He recruits Wu from Internal Affairs, choosing him for his integrity and lack of connection to the Land Sharks. Doyle agrees to help build a case against Cantor, asking for nothing in return.

Doyle makes a recorded call arranging to meet Cantor at Mama Rosa's, a restaurant in Williamsburg, Brooklyn. Bennett outfits him with a Kevlar-lined T-shirt containing a hidden tracker and places a transmitter in his pocket. At the restaurant, Cantor acknowledges the killings over the transmitter, calling them "necessary" for her political future, and urges Doyle to try again to kill Bennett. Then she spots Wu through the window, finds the transmitter, and opens fire. She shoots Doyle three times; the Kevlar stops one round, but two wound him. Bennett creates a feedback squelch with the band's microphone to draw her fire away from civilians. In the ensuing firefight, Bennett and Trilling hit Cantor in the shoulder and side. She tries to turn the gun on herself, but Bennett tackles her and wrestles the pistol away.

Doyle flees during the chaos, shedding the tracker-equipped shirt by giving it to a stranger and vanishing. Cantor's arrest dominates the news, with media reports revealing the Land Sharks' history of failing to report seized money, though some coverage notes the funds were redirected toward investigations and community projects. Bennett reflects that Cantor's ambitions likely extended beyond City Council to the mayoralty, explaining the scale of her cover-up.

The family storylines resolve on a hopeful note. Mary Catherine is cleared to ease off bed rest, and an ultrasound confirms the pregnancy remains viable. Bennett's son Ricky auditions for Rising Chefs, where the host cruelly insults his cooking; Ricky's brother Brian confronts the chef, and Ricky leaves with his confidence intact. Trilling's romantic life also settles. After meeting paramedic Mariah Wilson at a crime scene, he begins dating her and brings her to a Bennett family Sunday dinner, where Juliana Bennett, one of Bennett's daughters, quietly retreats, hurt by Trilling's date. Juliana later visits Trilling's apartment, discovers his roommates, and kisses him. Trilling ends things with Mariah and begins a relationship with Juliana.

In the final chapter, Doyle lies on a beach near La Ceiba, Honduras, recovering from his gunshot wounds. Amir provided first aid and helped him flee the country. Living under a false name, Doyle resolves never to return to contract killing and wonders whether a peaceful life might still be possible.