"Alfred, in the library there should be a copy of-"
"Alice's Adventures in Wonderland and Through the Looking-Glass by a Mr. Lewis Carroll. With a hearty breakfast of bacon and eggs. I'm a step ahead of you today, sir."
"It seems you are," Batman said with a light smile on his face. He was wearing the entire Batman costume sans the cowl, but anytime he was in the Bat-cave, he took upon the persona of the Dark Knight. "I see you heard that the Mad Hatter has escaped again."
"Yes, it was all over the news this morning. I do say, he isn't one you hear much about."
"No. But he's as deadly as most of the others. I can only imagine what he has in store for Gotham this time."
Alfred looked as if he was trying to remember something. "What precisely did he do last time? Didn't he use his mind control devices to try and kill Mayor Hill?"
"Yes. And I don't know who he could be going after this time," said Batman darkly. Alfred knew that Batman hated not knowing his enemy's next move.
"Master Bruce, it would be good if you came up to eat, really. You need some time out of this dank, mildewed cave. You'll catch your death of cold."
"I can't, Alfred. I need to figure out why Tetch's twisted mind wrote this message on the wall." He flicked a few switches on the computer console in front of him, and almost immediately, a host of images appeared on screen. They all were pictures Batman had secretly taken at the scene of Tetch's disappearance. And they all showed the message Tetch had scrawled on the cell wall in his own blood.
"No room?" said Alfred slowly. "Now, I know that's familiar." Alfred flipped through his copy of Alice's Adventures in Wonderland. "This used to be my favorite children's book," he continued absent-mindedly. "And I know that line is in here somewhere."
As he flipped rapidly, Batman took a bit of his breakfast.
"Aha! Here it is. It seems the March Hare and the Mad Hatter yelled 'No room!' to Alice at the very start of the Mad Tea Party. I don't know why Mr. Tetch would use the line in his cell room."
Batman chewed on a piece of bacon, considering what he knew of Jervis. "Well, it fits well. 'No room' meaning that he couldn't stand being in the room anymore. And he left. Hopefully, that's all it meant. For the sake of Gotham, I pray that's all it meant."