The black-and-white checkered police car swung into Lennox Avenue, slowed to a crawl while Conrad leaned out of the window to catch a glimpse of the numbers of the houses.

“Across the road, about ten yards up,” he said to Bardin, who was driving.

Bardin pulled across the road and stopped the car outside the four-storey house. Both men got out of the car and stood for a moment surveying the house.

Conrad’s heart was beating unevenly. He was excited. When McCann had telephoned through to his office to tell him the girl, Frances Coleman, had been located at 35, Lennox Avenue, he could scarcely wait for Bardin to collect him in the police car.

“You’ll be soon out of your misery,” Bardin said, grinning. “What’s the betting she didn’t see anyone?”

“Come on, let’s ask her,” Conrad said, pushing open the garden gate. As he walked up the path to the front door, he spotted a movement in the ground floor window and caught sight of the shadow of a man, lurking behind the curtains. The shadow hurriedly ducked back out of sight as Conrad turned his head to look at the window.

Conrad paused to read the name-plates on the door, then dug his finger in the second bell, opened the front door and walked briskly across the hall and up the stairs, followed by Bardin.

They stopped outside the front door on the second-floor landing, and Conrad knocked. They waited a few moments, then as no one answered the door, Conrad knocked again.

“Looks as if no one’s at home,” he said, frowning, after another minute’s wait. “Damn it! Now what are we going to do?”

“Come back later,” Bardin said philosophically. “I would have been surprised if anyone was in on a morning like this.”

They walked down the stairs together.

“Maybe the guy at the window knows where she’s gone,” Conrad said as he reached the hall. “From the way he was peeping at us, he shouldn’t miss much.”

“What’s the excitement?” Bardin said. “We’ll come back this afternoon.”

Conrad was already knocking on the front door to the right of the main entrance. There was a longish delay, then the door opened and a tall, bent old man in a tight-fitting black suit regarded them with big, watery blue eyes.

“Good morning, gentlemen,” he said. “Is there something I can do for you?”

“I’m Paul Conrad of the District Attorney’s office, and this is Lieutenant Bardin, City Police,” Conrad said. “We have business with the people in the second-floor apartment. They seem to be out. You wouldn’t know when they will be back?”

The old man took out a big red silk handkerchief and polished his nose with it. Into his watery blue eyes came a look of intense excitement.

“You’d better come in, gentlemen,” he said, standing aside and opening the front door wide. “I’m afraid you will find my quarters a little untidy, but I live alone.”

“Thank you,” Conrad said, and as they followed the bent old figure into the front room, he and Bardin exchanged resigned glances.

The room looked as if it hadn’t been dusted or swept or tidied in months. On the old, well-polished sideboard stood an array of whisky bottles and about two dozen dirty glasses. Most of the bottles were empty, but the old man found an unopened one and began to pick off the tinfoil around the cap with unsteady fingers.

“Take a seat, gentlemen,” he said. “You musn’t think I’m used to living like this, but I lost my wife some years ago and I sadly miss her.” He managed to get the bottle open and looked vaguely at the dirty glasses. “I should introduce myself. I am Colonel Neumann. I hope you gentlemen will join me in a drink?”

“No, thank you, Colonel,” Conrad said briskly. “We’re in a hurry. Did you happen to notice if Miss Coleman went out this morning?”

“Then if you really won’t, I think I will,” the Colonel said, pouring a large shot of whisky into one of the glasses. “I’m an old man now and a little whisky is, good for me. Moderation at all times, Mr. Conrad, and there’s then no harm in it.”

Conrad repeated his question in a louder voice.

“Oh, yes. They all went out,” the Colonel said, carrying the glass of whisky carefully to a chair and sitting down. “You mustn’t think I pry on people, but I did notice them. Are they in trouble?” The hopeful, intent curiosity in his eyes irritated Conrad.

“No, but I’m anxious to talk to Miss Coleman. Do you know her?”

“The dark one?” The Colonel smiled. “I’ve seen her: a pretty thing. What would the police want with her, Mr. Conrad?”

“Do you happen to know where they have gone?”

“They said something about the amusement park,” the Colonel said, frowning. “I believe I heard one of them say something about going for a swim.”

Conrad grimaced. He knew it would be hopeless to try and find Frances Coleman if she had gone to the amusement park. The place was always packed. He lifted his shoulders, resigned.

“Thank you, Colonel. I guess I’ll look back this afternoon.”

“You’re sure nothing’s wrong?” the Colonel asked, staring at Conrad. “I didn’t like the look of the man who followed them. He looked a rough character to me.”

Conrad stiffened to attention.

“What man, Colonel?”

The Colonel took a sip from his glass, put the glass down and wiped his mouth with his silk handkerchief.

“You mustn’t get the impression that I’m always at the window, Mr. Conrad, but it did happen I looked out as they were walking down the street, and I saw this man in a car. He drove slowly after them: a yellow-headed man; a young man, but I didn’t like the look of him at all.”

“Who was Miss Coleman with?” Conrad asked sharply.

“With her friends.” The Colonel showed his disapproval by a gentle snort. “That fellow who wears his shirt outside his trousers: I wish I had had him in my regiment. I’d have taught him how to dress like a gentleman! Then there’s that Boyd girl: a cheeky little piece if ever there was one. It’s a damn funny thing how some girls don’t mind what a fellow looks like. Different in my day, I can tell you. I shouldn’t have thought Miss Coleman would have cared to be seen out with that fellow with the birth-mark. But she’s a kind little thing: perhaps she took pity on him.”

Conrad and Bardin exchanged looks. Both of them knew Pete Weiner by sight, although he hadn’t actually been through either of their hands, but they knew he had done some jobs for Maurer.

“What fellow with a birth-mark?” Bardin barked.

The Colonel blinked at him.

“I don’t know who he is. I’ve never seen him before. He had a naevus — isn’t that what they call it? — down the right side of his face.”

“Was he dark, slightly built, looked like a student?” Bardin demanded.

“Yes. I’d say he could be a student.”

“And this other fellow; the one in the car: was he driving a Packard? A short, square-shouldered guy with light blond hair and a white face?”

“That seems a very fair description of him: a vicious character. I don’t know about the car. I didn’t notice it. Do you know him then?”

“You say this guy with the birth-mark went with these other three?” Bardin said, ignoring the Colonel’s question.

“Oh, yes. I watched them go down the street. They picked up a little car at the garage you can see from here. The blond man in the car followed the little car.”

By now Conrad was alarmed. From the description the Colonel had given of these two men, he had no doubt they were Pete Weiner and Moe Gleb.

“Thanks,” he said, moving to the door. “Sorry to have taken up so much of your time.”

“But you’re not going so soon?” the Colonel said, getting to his feet and slopping what was left of his whisky in his anxiety to head Conrad off from the door. “You’re surely going to explain…”

But by this time Conrad was half-way down the path with Bardin at his heels. They got into the police car.

“Well, how do you like it now?” Conrad asked grimly. “We’ve got to get moving, Sam. We’ll go to the garage first. They may have a description of the car. I’ll go on to the amusement park and you organize some help. We’ll need forty or fifty men in a hurry.”

“For crying out loud!” Bardin exclaimed blankly. “What do we want with forty or fifty men? You and I can handle this.”

“Can we?” Conrad was pale and his eyes angry. “That girl is in a crowd of about fifty thousand people. Right at her heels are two of Maurer’s hoods. What do you imagine they are there for? Do you think I’m going to let them wipe her out the way Paretti wiped out all those other witnesses? We’ll want all the help we can get. I’m going to save that girl if it’s the last thing I do!”