At 2:07 in the morning, a dying billionaire called my phone by mistake and begged me not to let her die alone.

At 7:45 the following morning, the rain had cleared, leaving the Boston streets scrubbed clean, the air smelling of salt water and wet asphalt.

I sat in my truck two blocks from the Perry Elementary School on East Seventh Street in South Boston, watching the crosswalk through a pair of high-magnification Steiner binoculars.

Lily walked toward the school gate, wearing her yellow raincoat, her backpack bouncing against her shoulders. Beside her walked Master Sergeant Hayes—one of the four operators Vance had dispatched from Devens—dressed in a faded navy union windbreaker, holding a paper cup of coffee, looking for all the world like an off-duty dockworker walking his niece to class.

Fifty yards behind them, parked at the curb beside a rusted fire hydrant, sat a dark gray Audi sedan with tinted windows and commercial plates from Rhode Island.

The Audi’s engine was idling. The exhaust plume was thin, pale white in the morning chill.

Inside the vehicle, two men sat in the front seats. The passenger had a long-range Nikon camera resting on the door frame, its telephoto lens tracked squarely on the back of Lily’s yellow coat.

My radio clicked twice.

"Eagle Six, this is Watchdog One," Hayes’s voice came through my earpiece, low, conversational, the tone of a man ordering a breakfast sandwich. "We have eyes on the Rhode Island tag. Vehicle has been shadowing the subject since we cleared the expressway at six-thirty. Authorization to interdict?"

"Negative, Watchdog," I said, putting my truck into gear. "Maintain escort until the subject is inside the perimeter fence. I’ll take the car."

"Copy that, Six. Gate secured in five seconds."

I eased the F-150 out from behind the bakery delivery van, rolling down the center of Seventh Street at fifteen miles an hour.

The driver of the Audi saw me in his rearview mirror. He didn't panic; he was a professional. He indicated right, signaling his intention to pull away from the curb into traffic, but I didn't give him the asphalt.

I dropped the transmission into low gear, cut the wheel thirty degrees, and drove the heavy steel cattle guard of my truck directly into the Audi’s front left quarter panel.

The sound of shearing fiberglass and crumpling steel echoed down the residential street like an explosive charge. CRUNCH.

The Audi’s suspension groaned; the front left wheel was pinned against the curb, the steering tie-rod snapped like a dry twig.

Before the steam from the ruptured radiator had cleared the hood, I was out of the cab.

I was not wearing my Carhartt jacket. I wore a black tactical sweater, my Glock 19 drawn and held at the low-ready, my badge case displayed flat against my chest: UNITED STATES ARMY - CRIMINAL INVESTIGATION DIVISION - SPECIAL AGENT.

I reached the driver’s door in three strides.

The glass was tinted, but I didn't bother knocking. I brought the reinforced steel pommel of my combat knife down against the lower corner of the window. The safety glass shattered into ten thousand frosted pebbles that sprayed across the driver’s face and shoulders.

I reached through the ruined frame, caught the driver by the throat, and hauled his face hard against the door rim.

"Turn the key," I commanded. My voice had no anger in it; it had the cold, terrifying weight of a hydraulic press. "Turn it with your left hand, or I will break your clavicle over this sill."

The driver, a thick-necked man in his late thirties with a military crew cut and the pale, dead eyes of a private contractor, reached down with trembling fingers and killed the ignition.

The passenger reached inside his leather bomber jacket.

"Don't do it, Wyatt," I said softly, looking past the driver’s ear. "The sniper on the roof of the library fifty yards behind you has an armor-piercing round centered on your temple. If your fingers touch that holster, your partner is going to spend the next hour picking your skull out of the upholstery."

The passenger froze. Slowly, methodically, he raised both hands, spreading his fingers flat against the dashboard.

I reached into the cab, pulled the driver’s door latch from the inside, and dragged the man out onto the wet asphalt, planting my knee between his shoulder blades before he could find his balance.

I pulled his wallet from his hip pocket, flipping it open with one thumb.

Commonwealth Security Solutions - Boston / Providence. Name: Vance, Donald. Retired USMC - 0311 Infantry.

"Donald," I said, leaning down until my mouth was three inches from his ear. "You’re Julian Vance’s nephew. The one who got kicked out of the Corps for stealing night-vision goggles from the supply armory at Lejeune."

Donald gasped against the pavement, the gravel cutting into his cheek. "You're a dead man, Carter. You don't have jurisdiction here. This is civilian street. We're private investigators licensed by the state—"

"I’m not a police officer, Donald," I whispered, pressing my thumb into the nerve cluster behind his ear until his vision blurred. "I'm Captain Daniel Carter, Task Force 44. Under Title 10 of the United States Code, you are currently engaged in active espionage and witness intimidation against an ongoing military counter-proliferation investigation. That means you aren't going to the Charles Street jail. You’re going to a subterranean holding cell at Fort Devens under military detention."

The man’s mouth went dry. "Military? Julian... Julian said you were an electrician. He said you were a washed-up sergeant who got out four years ago."

"Julian doesn't know how to read an encrypted personnel file," I said. "Now, you have twenty seconds to give me the frequency for your team’s tactical net, or I leave you in the trunk of this Ford until the state troopers find you at the bottom of the Mystic River."

"Channel four!" Donald wheezed, the bravado evaporating like mist over salt water. "Channel four, encrypted DMR, four-six-two megahertz! There are six of us! Two teams at the school, two at the house in Brookline, and two with Marcus at the marina!"

"What is Marcus doing at the marina?"

Donald swallowed hard, his eyes wild with terror. "The yacht... the Cavalier. They’re loading the server backups from the New Bedford plant onto the boat right now. They’re clearing customs for the Bahamas at noon."

I pulled a pair of heavy-duty plastic zip-ties from my belt, ratcheting his wrists behind his back with two sharp, surgical zips.