Dulcie had started on toward the back when a new sound froze them. The scrape of wood on concrete. Then a little click. They crept up to the front, to look.

Below them in the hall the watchman had set up a wooden stepladder, and an officer was climbing. They backed away and ran, heading for the back vent.

They were crouched by the vent when the officer rose above the wall of the first locker. Tilting his head sideways, pressing his forehead against a rafter, he managed to look over into the first little room, peering down through the six-inch gap.

"This one's empty, some furniture but nothing to hide under."

The minute he vanished again, presumably to move the ladder, they clawed a hole in the screen and pressed through. Poised on the sill, they stared down at the concrete walk nine feet below. They leaped together, landed hard, jolting every bone. And they ran, skirting along beside the fence. They were crouched to swarm up the six feet of chain link when Joe stopped and turned back.

"What?" She remained poised to leap.

"Idea," he said, briefly trotting away around the far end of the building. She followed him, puzzled and excited, toward the alley where the patrol cars were parked. When Joe was silent, some wild plan was unfolding.

He crouched at the corner, listening to the police radio. Carefully he peered around, down the alley toward the patrol cars.

"They're still inside. Come on."

She sped beside him toward the two squad cars. The drivers' doors stood open, maybe to give quick access to the radios. They slipped beneath the first car.

"Keep watch," he said, and slid up into the driver's seat, sleek and quick, a vanishing shadow.

She pictured him inside, stepping delicately among the cops' field books and gloves and radio equipment, then she heard him talking, his voice soft.

But when he pressed the button to talk, the voices and static were silent. Those cops would hear him, they'd come charging out. She crouched shivering beneath the car's open door, ready to hiss at Joe, ready to run like hell.

But the caretaker's raspy voice filled the air, steady and loud, as he told the three officers some long involved story. No one glanced toward the squad car.

Joe went silent, slid out and from the patrol car, a swift shadow, and they streaked away up the alley. Around the corner they sat down and made themselves comfortable beside the wall, to wait.

The third patrol car parked beside Mahl's locker. Not ten minutes had passed. They watched Captain Harper emerge. He was not in uniform but dressed in jeans and a Western shirt. Detective Marritt was with him, fully in uniform, his expression sour. As the two men moved inside, the cats approached, slipping down the alley close to the wall, crouching just outside the big open door, to listen.

Harper was puzzled, then angry. He went up the ladder for a look. Which officer had called in? No one had. Well why hadn't they? Didn't anyone wonder about those paintings? Didn't anyone look at them? What was the ladder for, if you didn't look at what was there? You could see two of the paintings clearly. Didn't anyone wonder about those big splashy landscapes? Didn't anyone recognize them?

When Harper sent the watchman to get a pole, the cats crouched under a squad car out of sight. The small, wiry man trotted by, looking half-afraid. He returned quickly, carrying a six-foot length of door molding.

They watched Harper climb the ladder and reach his pole to move the leaning paintings; he would be gently flipping them back one at a time, looking. Soon his voice, always dry, took on a quality of both excitement and rage.

"Didn't any of you connect this locker to Janet? Did you forget there's a case in court involving her death? Didn't you think it strange that so many of her paintings are here?

"Don't tell me that not one of you three recognized her work, after all the damned fuss and publicity. Didn't any of you remember the Aronson testimony, that there are only a few of her paintings left?"

Dulcie and Joe glanced at each other. Harper was really steamed.

"Didn't you think when you saw this stuff that it was worth checking out? What were you doing in here?

"And who called into the station, which one of you?"

None of the three had called.

Harper centered on the caretaker. "Did you use the police radio? Did you call in when you went to get the ladder?"

The old man swore he hadn't. Harper said if none of them had called, then who did? Why did he have to rely on some anonymous informant, and how the hell did an informant get hold of a police radio? The cats could tell he was itching to get back to the station and get to the bottom of the puzzle.

When Harper began on the watchman, boring in, the cats felt sorry for the old fellow. Little Mr. Lent said the man who had rented the locker was a Leonard Brill, Brill had given a San Francisco address. Mr. Brill was, Lent said, extremely nice and helpful. When the compound had been broken into a few weeks ago and the outer gate padlock cut off, it was Mr. Brill who saved the day, he had happened by shortly after the occurrence.

One of the officers remembered the incident. Lent had put in a call when he had found the lock cut off, but nothing had seemed disturbed inside the complex. They thought the break-in had been an aborted attempt, that perhaps the burglar had run off when the watchman showed up, had never actually gotten inside.

"And then Mr. Brill happened along," Mr. Lent said. "Just after the officers left. He'd seen the police cars, and wondered if there was trouble.

"Well it was dark, and most of the stores were closed. I didn't know where I was going to get a lock for the night, and I didn't want to leave the place open. Mr. Brill had a lock in his car, a brand-new heavy-duty padlock. He said I could use it. I told him I'd return it, soon as I got a new one, but he said, no need. Said he'd bought it for his garage down in Santa Barbara but then he'd changed his mind, had decided to put in a remote door opener. More secure, he said. Said he was always losing keys." Lent laughed. "I know about losing keys. If I didn't keep 'em chained to my belt, I wouldn't have a key to my name.

"I had to argue with him before he'd let me pay him. But after all, the lock had never been used, it was still sealed in its plastic bubble, still in the hardware store bag with the receipt. So of course I paid him. Management reimbursed me later. Nice man, Mr. Brill, a real gentleman."

Lent's description of Brill was large, hunched, and rather owl-like in appearance but handsomely dressed, a fine camel hair sport coat, and a nice car, a red sports coupe of some kind.

"Maybe a rental," Joe said. This explained the bolt cutters in Mahl's closet. Explained nicely how, at three in the morning, Mahl was able to get into the complex. No problem, before ever he gave Lent the "new" lock, to carefully open the sealed package, have the key copied, then seal it up again with its keys.

The men stopped talking, the ladder rattled. The cats nipped back up the alley, they were crouched below the chain-link fence when they heard car doors slam, heard the first car start. One big leap and they were up, clinging to the wire. Scrambling over, within seconds they were headed home, Dulcie purring so loud she sounded like a sports car slipping down the street.

"I'm glad her paintings are safe. I told you we'd find them."

He brushed against her, licked her ear. "Without you, Mahl would have gotten away with it.

"And," he said, "Rob Lake might have burned for Janet's murder." And trotting along through the night, Joe grinned.

So Clyde thinks we don't have any business messing around with a murder case. So we ought to be chasing little mousies or playing with catnip toys. He could hardly wait to say a few words to Clyde.