I pulled my parka from the chair where I’d left it and took off after him. Po was bleeding slightly from her left shoulder, but the bullet must only have grazed her because she ran strongly. We tumbled down the stairs together and out the front door into the icy December night. As we went outside, I grabbed the dog and rolled over with her. I heard the gun go off a few times but we were moving quickly, too quickly to make a good target.

Street lamps showed our man running away from us down Halsted to Belmont. He wore the navy ski mask and khaki parka of the solitary runner I’d seen at the harbor yesterday morning.

Hearing Po and me behind him he put on a burst of speed and made it to a car waiting at the corner. We were near the Omega now; I bundled the dog into the backseat, sent up a prayer to the patron saint of Delco batteries, and turned on the engine.

The streets were deserted. I caught up with the car, a dark Lincoln, where Sheridan Road crossed Lake Shore Drive at Belmont. Instead of turning onto the drive, the Lincoln cut straight across to the harbor.

“This is it, girl,” I told Po. “You catch this boy, then we take you in and get that shoulder stitched up. And then you get your favorite dinner-even if it’s a whole cow.”

The dog was leaning over the front seat, panting, her eyes gleaming. She was a retriever, after all. The Lincoln stopped at the end of the harbor parking lot. I halted the Omega some fifty yards away and got out with the dog. Using a row of parked cars as cover, we ran across the lot, stopping near the Lincoln in the shelter of a van. At that point, Po began her deep, insistent barking.

This was a sound which would attract attention, possibly even the police, so I made no effort to stop her. The man in the Lincoln reached the same conclusion; a window opened and he began firing at us. This was just a waste of ammunition, since we were sheltered behind the van.

The shooting only increased Po ’s vocal efforts. It also attracted attention from Lake Shore Drive; out of the corner of my eye I saw the flashing blue lights which herald the arrival of Chicago ’s finest.

Our attacker saw them, too. A door opened and the man in the ski mask slid out. He took off along the lake path, away from the harbor entrance, out toward the promontory. I clapped my hands at Po and started running after him. She was much faster than me; I lost sight of her in the dark as I picked my way more cautiously along the icy path, shivering in the bitter wind, shivering at the thought of the dark freezing water to my right. I could hear it slapping ominously against the ice-covered rocks, could hear the man pounding ahead of me. No noise from Po. Her tough pads picked their way sure and silent across the frozen gravel.

As I rounded the curve toward the promontory I could hear the man yelling in Spanish at Po, heard a gun go off, heard a loud splash in the water. Rage at him for shooting the dog gave me a last burst of speed. I rounded the end of the point. Saw his dark shape outlined against the rocks and jumped on top of him.

He was completely unprepared for me. We fell heavily, rolling down the rocks. The gun slipped from his hand, banged loudly as it bounced against the ice and fell into the water. We were a foot away from the water, fighting recklessly-the first person to lose a grip would be shoved in to die.

Our parkas weighted our arms and hampered our swings. He lunged clumsily at my throat. I pulled away, grabbed hold of his ski mask and hit his head against the rocks. He grunted and drew back, trying to kick me. As I moved away from his foot I lost my hold on him and slid backwards across the ice. He followed through quickly, giving a mighty shove which pushed me over the edge of the rock. My feet landed in the water. I swung them up with an effort, two icy lumps, and tried to back away.

As I scrabbled for a purchase, a dark shape came out of the water and climbed onto the rock next to me. Po. Not killed after all. She shook herself, spraying water over me and over my assailant. The sudden bath took him by surprise. He stopped long enough for me to get well away and gain my breath and a better position.

The dog, shivering violently, stayed close to me. I ran a hand through her wet fur. “Soon, kid. We’ll get you home and dry soon.”

Just as the attacker launched himself at us, a searchlight went on overhead. “This is the police,” a loudspeaker boomed. “Drop your guns and come up.”

The dark shape hit me, knocked me over. Po let out a yelp and sunk her teeth into his leg. His yelling brought the police to our sides.

They carried strong flashlights. I could see a sodden mass of paper, a small manila envelope with teeth-marks in it. Po wagged her tail and picked it up again.

“Give me that!” our attacker yelled in his high voice. He fought with the police to try to reach the envelope. “I threw that in the water. How can this be? How did she get it?”

“She’s a retriever,” I said.

Later, at the police station, we looked at the negatives in the envelope Po had retrieved from the water. They showed a picture of the man in the ski mask looking on with intense, brooding eyes while Santa Claus talked to his little boy. No wonder Cinda found him worth photographing.

“He’s a cocaine dealer,” Sergeant McGonnigal explained to me. “He jumped a ten-million-dollar bail. No wonder he didn’t want any photographs of him circulating around. We’re holding him for murder this time.”

A uniformed man brought Jonathan into McGonnigal’s office. The sergeant cleared his throat uncomfortably. “Looks like your dog saved your hide, Mr. Michaels.”

Po, who had been lying at my feet, wrapped in a police horse blanket, gave a bark of pleasure. She staggered to her feet, trailing the blanket, and walked stiffly over to Jonathan, tail wagging.

I explained our adventure to him, and what a heroine the dog had been. “What about that empty film container I gave you this afternoon, Sergeant?”

Apparently Cinda had brought that with her to her rendezvous, not knowing how dangerous her customer was. When he realized it was empty, he’d flung it aside and attacked Cinda. “We got a complete confession,” McGonnigal said. “He was so rattled by the sight of the dog with the envelope full of negatives in her mouth that he completely lost his nerve. I know he’s got good lawyers-one of them’s your friend Oldham-but I hope we have enough to convince a judge not to set bail.”

Jonathan was on his knees fondling the dog and talking to her. He looked over his shoulder at McGonnigal. “I’m sure Oldham ’s relieved that you caught the right man-a murderer who can afford to jump a ten-million-dollar bail is a much better client than one who can hardly keep a retriever in dog food.” He turned back to the dog. “But we’ll blow our savings on a steak; you get the steak and I’ll eat Butcher’s Blend tonight, Miss Three-Dot Po of Blackstone, People’s Heroine, and winner of the Croix de Chien for valor.” Po panted happily and licked his face.