"It's this one," said Fatty, and looked cautiously round. "Anyone about? Not a soul I Here goes, then!"

He opened the window quietly, hauled himself up and dropped down into the hall. Larry followed. The boys shut the window carefully, in case any one noticed that it was open.

The hall wasn't dark, because a lamp from the Fair nearby shone into it, and gave a fint and rather eerie light to the still waxworks.

The boys looked round them. The figures somehow seemed more alive than in .the daytime, and Larry gave a little shiver. Silly fancies crept into his head. Suppose wax figures came alive at night and walked and talked!

What a dreadful shock it would give him and Fatty!

"They all seem to be looking at us," whispered Larry. "They make me feel quite creepy. Look at Nelson—he's watching us all the time!"

"Idiot!" said Fatty, walking over to Napoleon. "Come on—help me to undress him, Larry."

It was a queer business, undressing the rather plump figure of the wax Napoleon. It wasn't easy, either, because Napoleon didn't help in any way! In fact, it almost seemed as if he quite deliberately tried to make things difficult for the two boys!

"If only he'd raise his arms a bit, or give a wriggle, or something," whispered Larry. "We could get his things off easily then. But he just makes himself as stiff as possible!"

Fatty chuckled. "I'd get a shock if he did raise his arms or wriggle!" he said. "I'd just as soon he didn't. There—his coat's off, thank goodness—but I've torn his high collar a bit. Now for his trousers."

Soon poor Napoleon stood stiff and straight in nothing but some kind of shapeless under-garment. The boys lifted him up and carried him to a cupboard. They put him inside and shut the door. Then Fatty proceeded to undress himself very quickly. He stuffed his own clothes into the cupboard with Napoleon.

Then, with Larry's help he put on Napoleon's clothes. They fitted him quite well, and he only had to use one of Daisy's safety-pins. He pulled on the coat, and the medals made a little jingling noise.

"Fatty! You look marvellous in that uniform!" said Larry, in admiration. "You honestly do! Now the hat—golly, it fits you as if it was made for you!"

Fatty made Larry hold up a small mirror and looked at face in it. It was all covered with pink, and looked very like the faces of the wax figures around. Fatty pulled a strand of hair on to his forehead, just like the one the wax Napoleon had had. Then he put his hand under his coat, stood absolutely still and stiff, and stared straight in front of him.

Larry couldn't find enough words of praise. "Nobody, nobody could possibly guess you weren't a wax figure!" he said. "You're marvellous, Fatty! Honestly, you're more of a wax figure than Napoleon was before! I wish you could see yourself, I really do. Golly, it's wonderful!"

Fatty was pleased. He beamed modestly at Larry, but not too broadly in case the wax on his face cracked a bit.

"It's only your eyes that are different from the other wax figures," said Larry. "They've got a proper light in them—the others haven't. Yours shine."

"Well, I hope they won't shine too much!" said Fatty. "Now, you'd better go, Larry, old boy. It's about half-past eight, isn't it? The men might be here early."

"Right," said Larry—and then he suddenly stood stock-still in fright. It sounded as if some one was fumbling at the door of the hall!

"Go, quickly!" said Fatty, in a whisper, and Larry fled, threading his way carefully between the silent figures till he came to the window at the back of the hall. He opened it cautiously, climbed up and dropped out, shutting it again at once. He dived under a bush and sat there, hardly daring to breathe, mopping his forehead with his handkerchief.

He pictured the gang walking in silently, and he felt glad he was not Fatty, all alone there, hidden in the rows of waxwork figures. Golly, he'd only got out just in time!

Fatty was waiting in the greatest excitement for the hall door to open. Who would come in? The leader of the gang? All the men? Would he know any of them?

The fumbling at the door went on. Somebody seemed to be having difficulty with the key. But at last it turned and the door opened quietly. Somebody stepped in, and shut the door—and locked it! Why lock it? Fatty was puzzled. Weren't the others coming in too, then?

The silent-footed person moved down the hall, and the light from the Fair lamp outside shone down on him. Fatty got a most tremendous shock.

It was Mr. Goon!

"Goon!" thought Fatty, and he almost fell off his step. "Old Clear-Orf! Goon! But—is he one of the gang then? Goon here, with the thieves! What's it all mean?"

Mr. Goon proceeded to do a few very peculiar things. He walked behind Fatty until he came to one of the wax figures. Fatty did not know which one, for he dared not move or turn round to see what Goon was doing.

Mr. Goon then lifted up the figure, and, panting noisily, carried it to a big window, where a voluminous curtain hung. Then Fatty was able to see which figure Mr. Goon was carrying.

It was the wax policeman! Mr. Goon carefully placed him behind the curtain, and then creaked back to the place where the wax figure had stood.

And, in a flash, Fatty understood everything. He almost groaned in disappointment.

"Of course—Goon has read the secret message in that grocery list after all—he found out, as we did, that a meeting of the Gang will be held here tonight—and he I’ll got the same brain-wave too. He thought he'd come and be one of the wax figures, and listen in to everything! Golly—he's got more brains and pluck than I'd have thought he had!"

Poor Fatty! It was a great shock and disappointment to him to know that the policeman would hear everything, and be able to solve the Mystery after all. He would know the Gang—and their plans—and would be able to arrest the whole lot of them at once!

But surely he wouldn't dare to tackle the whole gang single-handed? No—that couldn't be his plan. Then what was it? Fatty stood and puzzled his brains, angry and miserable to think that Goon should have been clever enough to think of exactly the same idea as the Find-Outers.

"But it was much more difficult for me" thought Fatty. "I had to undress the figure of Napoleon and dress myself up again—Goon only had to go and stand in the place of the wax policeman. We always did think that the wax figure was like Goon! Blow! Everything's spoilt."

Fatty would have given anything to turn round and see what Goon looked like, standing stiffly there some way behind him. Goon was breathing very heavily, as he always did when he was excited. Fatty wondered if he would remember to breathe quietly when the Gang came in! Then Goon did a little cough, and cleared his throat.

"Of course, he thinks there's nobody here at all," thought Fatty. "So it doesn't matter what noises he makes. I want to cough, myself—but I daren't, because Goon would be very suspicious at once. What a shock it would give him, to hear one of the waxworks cough.

I wonder if he'd get scared and go flying out of the hall at once! No, I don't think he would!"

Mr. Goon shuffled his feet a little and sniffed. Then he got out his handkerchief and blew his nose.

Fatty immediately wanted to blow his too! It was most irritating wanting to sniff and cough and blow his nose when he dared not make a single movement. Spoiling everything! Enjoying himself sniffing and coughing. Waiting for his Big Moment—and thinking of Promotion!

There came the sound of voices outside. Then a key was put into the door, and it opened. "Ho!" thought Fatty, "Mr. Goon had a duplicate key, had he? He made his plans well. Locked the door after him, too, so that the men shouldn't get suspicious, as they would have if the door had been unlocked!"

Four men came in. Fatty strained his eyes to try and see what their faces were like. But one and all wore soft hats pulled well down over their foreheads. They did not light a lamp, nor did they even use torches. The faint light from the Fair lamp outside seemed to be enough for them.