"Wassat? " he said at last, putting his hand behind his ear.

That was too much for Mr. Goon. He caught hold of Fatty's collar and marched him quickly up the lane.

"You've been ‘wassating' me long enough!" said the annoyed Mr. Goon. "I don't know how you got out—but I do know you're going in again—and this time I'll lock the door on you meself! And there you'll stay 'till you see sense if it takes you a month!"

Fatty didn't like this at all. He debated whether or not to let Mr. Goon into the secret of his disguise. But before he had made up his mind, he was at the police-station. Mr. Goon was unlocking a door, and Fatty was being pushed into the dark, narrow little room behind.

And in it was the real old man! He stared at Fatty and Fatty stared at him. The old chap let out a howl. He was beginning to feel he must be mad. Why, here was himself staring at him! What was happening?

Mr. Goon heard the howl and looked into the room—and then he saw the two old men! Exactly alike. As like as peas in a pod. Mr. Goon sat down heavily on a chair and mopped his forehead with a big handkerchief. He felt dazed. What with vanishing cigarettes, men that got locked up and then got out—and now two old men exactly alike—well, Mr. Goon began to feel that he must be lying asleep and dreaming in his own bed at home, and he fervently hoped that he would soon wake up.

"Lemme get out of here!" said the real old man, and tried to push past Mr. Goon. But the policeman caught hold of him. He wasn't going to have any more disappearings. He was Going to Get to the Bottom of Things.

Fatty saw that things had gone far enough, and he did not like the thought of his parents knowing that he was locked up at the police-station. So he spoke to Mr. Goon in his ordinary voice, and gave the poor man another terrible shock.

"Mr. Goon! I'm not really an old man. I'm Frederick Trotteville."

Mr. Goon's mouth fell open. He gulped once or twice, staring at Fatty as if he couldn't believe his eyes. Fatty twitched off his beard, and then Mr. Goon did indeed see that it was Fatty. He dragged him out of the dark little room, slammed and locked the door, and took Fatty into an office.