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ONE

JUST AFTER SIX that morning, Warren Jacobi, a sixty-year-old retired homicide lieutenant and former chief of police, parked his Ford F-150 within walking distance of one of the eastern entrances to Golden Gate Park.

Jacobi was edgy in the best possible way, amped up, excited, feelings he hadn’t had in years. Today was the day. After weeks of planning and tracking, within the next hour, he would bring down a killer.

He was a big man, 240 pounds, but he’d stayed in shape. This morning, he wore his bird-watching gear, camouflage pants, and a matching sweater under his tac vest. Binoculars hung from a strap around his neck, and his weapon was wedged against the small of his back by the waistband of his pants.

Jacobi entered the park, keeping to the tree shadows, looking for a merciless killer who delighted in outfoxing the police. Jacobi had to do this alone, and he could—but he was still haunted by the bureaucratic bull crap that had forced him into early retirement. He hadn’t been able to shake the humiliation. Bottom line, he would not, could not, close out his life’s work by leaving this psychotic predator at large.

Jacobi quickly slipped into a narrow pocket of rampant vegetation, a cleft in the living walls of dense vines and saplings. Inside this natural bivouac, he was virtually invisible but had partial views of the path looping around the Lily Pond below and back up to the street.

Years ago, he’d been walking the park when he saw a man acting suspiciously near the Lily Pond. When a teenage girl’s dead body was pulled from the pond later that day, Jacobi knew what he’d witnessed—and what he’d failed to do earlier. He’d been too far away, and it had happened too quickly, for him to even make an ID.

Parting branches and peering around a clump of trees now, Jacobi saw a great blue heron swoop down between the treetops and veer toward the pond. Through the zoom lens in his phone, Jacobi followed the large heron’s flight path, then took pictures of the bird with its dark crown and long gray plumes on its breast. Below the heron, at the edge of the pond, Jacobi spotted his subject wearing a dark windbreaker, jeans, and a dark-colored baseball cap. The killer took a gun from his pocket and threw a shot at the bird. The bird veered away at the sound, and the shooter tossed the gun into the water. There was a splash, and then he turned on the path and slowly began to retrace his steps uphill.

Jacobi waited impatiently. He didn’t have the authority to perform an arrest, but the former detective had zip ties in his vest pocket. Jacobi planned to surprise the guy as he walked past his hidey-hole and bodycheck him to the ground. Then, once he’d immobilized the SOB, he’d call Chief of Police Charles Clapper to let him know that he had a wanted killer secured and ready for roasting.