He tried to stare back bravely at the man, but it was difficult. Fatty wished desperately he had not gone into this midnight venture so light-heartedly. He longed for old Buster. But perhaps it was as well that Buster was not there. These men might kick him and misuse him cruelly.

“We shall lock you up,” said the thin-lipped man. “We have to go in a little while, but we shall come back soon. You will write this note whilst we are gone. If it is not done by the time we come back, there will be trouble for you, bad trouble - trouble you will not forget all the rest of your life.”

Fatty’s spirits went up a little when he heard he was to be locked up. He might be able to escape if so! He had a folded newspaper in his pocket. He was sure he could use his trick of getting out of a locked room all right. Then his high spirits sank again.

“We will lock you in this so-comfortable room,” said the red-faced man. “And we will give you paper and pen and ink. You will write a nice, excited note that will bring your friends here quickly. You can throw it out of the window.”

Fatty knew he could never escape from the secret room. A thick carpet ran right to the door. There was no space beneath the edge of the door to slip a key. None at all. He would be a real prisoner. He could not even escape down the tree because the window was so heavily barred.

The thin-lipped man placed a sheet of notepaper on a table, and laid beside it a pen and a little ink-stand.

“There you are,” he said. “You will write this note in your own way and sign it. What is your name?”

“Frederick Trotteville,” said Fatty gloomily.

“You are called Freddie, then, are you not?” said the thin-lipped man. “You will sign your letter ‘Freddie,’ and when your friends come into the garden, I will fling your note from the window - but you will not speak to them.”

The red-faced man looked at his watch. “We must go,” he said. “It is time. Everything is ready here. We will get the rest of these interfering kids and lock them up till we have finished. It won’t hurt them to starve for a day or two in an empty room!”