22 Seconds

The novel opens with a prologue set in the present before jumping back nine days. Cindy Thomas, senior crime reporter at the San Francisco Chronicle and fiancée of Homicide Inspector Rich Conklin, struggles to write a true-crime book about convicted serial killer Evan Burke. She worries about her closest friend, Sergeant Lindsay Boxer of the San Francisco Police Department (SFPD), who has been benched pending investigation of an officer-involved shooting tied to a restrictive new gun law. A blog post Cindy wrote supporting Lindsay drew backlash from gun-rights supporters, costing Cindy her crime beat assignment. As the prologue ends, a young man in a black sedan outside a bakery brandishes a gun, tells Cindy they need to talk about Lindsay, and punches her unconscious.

Nine days earlier, Lindsay's husband, Joe Molinari, a former deputy director of Homeland Security now working as a consultant, is paired by FBI section chief Craig Steinmetz with former partner Special Agent Mike Wallenger to arrest Alejandro Vega, a Mexican gun trafficker at a gun show. Meanwhile, Chief of Police Charles Clapper briefs officers on new restrictions banning automatic weapons, requiring GPS tracking on firearms, and outlawing untraceable "ghost guns." Lindsay, who stepped aside from the lieutenant position to work homicides, convinces her lieutenant, Jackson Brady, to let her work the city's gun buy-back program with Inspector Sonia Alvarez.

At the gun show, Joe poses as a customer, but a bystander spots his badge and warns Vega, who aims at Joe's head. Before anyone can identify themselves, Fred Braun, local division chief of the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF), fires two rounds into Joe's chest. Joe's Kevlar vest stops both bullets. In FBI custody, Vega privately tells Joe he is part of a start-up cartel smuggling military-grade weapons and drugs from Mexico to California. Joe also learns that former SFPD officer Brian Donahue apparently died by suicide, though Wallenger suspects the death was staged. When Joe and Wallenger travel to Mexico to deliver a letter to Vega's wife, armed paramilitaries block their car, interrogate them at gunpoint, and hold a knife to Joe's throat before releasing them.

Lindsay visits Chief Medical Examiner Claire Washburn, her best friend, who confirms Donahue's cause of death was fentanyl overdose ruled suicide but notes a suspicious quantity in his airways. At the Women's Murder Club's regular dinner at Susie's Café, where Lindsay, Claire, Cindy, and Assistant District Attorney (ADA) Yuki Castellano, Brady's wife, gather, Cindy finds a post showing another dead former cop in Oakland with his lips stapled shut and a note reading "You talk, you die." Lindsay identifies the victim as Roy Abend, a former Narcotics inspector who worked under Ted Swanson, a corrupt former SFPD lieutenant serving life at San Quentin for running a robbery and drug operation. Donahue's file also links him to Swanson. Lindsay pitches Brady on investigating both deaths as homicides, and he approves.

In a parallel storyline, Claire flies to the rural town of Rosewater to help autopsy Katie Caruso, a six-year-old who disappeared from her bed and was found dead in a ditch. The autopsy reveals Katie had type 1 diabetes and died of ketoacidosis, a painful but preventable condition caused by lack of insulin. Claire finds no insulin in the Caruso home. Both parents eventually admit they ran out, each assumed the other would handle it, and when Katie died, they placed her body in a ditch and fabricated an abduction story. Both are arrested.

Lindsay and Conklin interrogate Swanson at San Quentin, but he offers nothing useful. Frustrated, Lindsay shouts across the open common area as they leave, loudly thanking Swanson for his help, a taunt that falsely implies he cooperated with police. They also visit Chris Manolo, Lindsay's former confidential informant (CI), who confirms a new gun gang is moving weaponry from Mexico in trucks disguised with corporate logos. A third "You talk, you die" victim surfaces, and Clapper forms a task force including the homicide squad and FBI agents Joe and Wallenger.

Threats against Lindsay's family escalate. A caller during a live radio interview recites Joe's license plate and claims to have followed Lindsay. Their nanny reports being tailed, and Lindsay spots a dark BMW near their apartment occupied by three young men, including Anthony Ruffo Jr., a gun-rights protester, but police find no grounds to hold them. A fourth victim, prison guard Arthur Guthrie, is found dead on the Larkspur ferry. Then Swanson dies by suicide in his cell. Lindsay is stricken with guilt, believing her taunt branded him a cooperator. When she visits Swanson's wife, Kim Swanson, Kim reveals Ted was threatened: Kill himself or she would be "a dead mom walking."

ATF Chief Braun tells the task force the gun convoy is a fabrication, but Clapper dismisses him. Kenny Chen, a longtime confidential informant with Chinatown connections, offers Lindsay the time and location of the gun exchange for $100,000. Clapper authorizes a $50,000 down payment. On the night of Julie's fourth birthday dinner, Chen calls to say the location has changed. Lindsay and Brady drive alone to Carroll Avenue in Bayview, where a black Jeep blocks their car and its occupants open fire. Lindsay rams the Jeep into a wall, and they return fire. She finds Chen behind the wheel, badly wounded, and Kim Swanson fatally shot as the passenger. Chen asks about the $50,000 before losing consciousness, suggesting the exchange was fabricated to lure Lindsay and steal the money. Both officers surrender their weapons per protocol.

The narrative catches up to the prologue: Cindy regains consciousness, and her attacker tells her to relay a message to Lindsay: "It's not over yet." Surveillance video confirms the Carroll Avenue shootings were self-defense, and Lindsay is reinstated. Conklin identifies Cindy's attacker as Ruffo Jr., who is arrested.

Alvarez discovers Kim's house was purchased by James Ransom, Swanson's former patrol partner. Under interrogation, Ransom reveals Swanson paid him monthly via a Mexican bank to watch over Kim and relay coded messages from prison guard Guthrie through Kim to another contact. With cameras off, Ransom writes the contact's name on Brady's notepad. A fifth victim, San Diego Sergeant Royce Bleecker, is found with military weapons in his garage, and FBI cryptanalysts decode text from his phone revealing a shipment date and the initials "6-2," interpreted as F.B. Both Ransom's identification and the decoded initials point to Braun.

Clapper lures Braun to San Quentin with a fake envelope while Lindsay, Joe, and Wallenger search Braun's house under a federal warrant, finding military weapons and heroin. Braun is arrested and, under pressure, reveals tunnel exit locations in Otay Mesa near San Diego. FBI Special Agent in Charge Analise Thompson briefs operatives on intercepting the shipment at two factory sites. Joe proposes collapsing the tunnels with explosives once the drug runners emerge. That night, fentanyl and mules rise through the factory floors; the tunnels are detonated, and most runners are captured in a massive joint operation.

Joe and Lindsay drive a seized truck north for a final sting on Potrero Hill, where undercover officers pose as sellers. When transactions are complete, Brady announces buyers are under arrest. One driver rams through the gates and crashes: It is Vega, who escaped Mexican custody. Cooperating in exchange for serving his sentence in California, Vega confirms the operation was conceived by Swanson and Braun and identifies the "You talk, you die" killer as his cousin, Ruffo Jr., the same man who assaulted Cindy and stalked Lindsay's family.

In the aftermath, Lindsay and Joe retrieve their daughter Julie, and the family begins to recover. Cindy's literary agent calls to praise the manuscript of her true-crime book. Claire helps 12-year-old Lily Wong, Kim Swanson's daughter, identify the biological father of Kim's young son, Tommy, as Ransom, who begins the custody process after DNA confirmation. Lily's future remains uncertain, but Claire promises the girl she is on her side.