The door handle turned. Someone knocked, and a man's voice called, "Uh, hello?"
Valkyrie looked at Skulduggery, looked back at the others, looked at Skulduggery again.
"Hello," Skulduggery said, speaking loudly to be heard over the alarm.
"Hi," said the man. "The door's locked."
"That's funny" said Skulduggery. "Hold on a moment." He reached out, jiggled the handle a few times, then stepped back. "Yes, it's locked. You wouldn't happen to have the key, would you?"
There was a delay in response from the other side. "I'm sorry," the man called, "Who am I speaking with?"
Skulduggery tilted his head. "Who am I speaking with?"
"This is Oscar Nightfall."
"Are you sure?"
"Are you sure you are who you say you are? This is the Great Chamber, after all. It's a very important place for very important people. It is not beyond the realms of possibility that someone, and I'm not saying that this applies to you in particular, but someone could conceivably lie about who they are in order to gain access to this room. I have to be vigilant, especially now. There's a war on, you know."
Oscar Nightfall sounded puzzled. Who are you?"
"Me? I'm nobody. I'm a cleaner. I'm one of the cleaners. I was cleaning the thrones and the door shut behind me. Now I can't get out. Could you try and find a key?"
"What's your name? Give me you name."
"No. It's mine."
"Tell me your name!"
"My name is Oscar Nightfall."
"What? No it isn't. That's my name."
"Is it? Since when?"
"Since I took it!"
"You didn't ask me if you could take it. I was using it first."
"Open this door immediately."
"I don't have the key."
"I'll fetch the Cleavers."
"I found the key. It was in the keyhole. It's always the last place you look isn't it? I'm unlocking the door now. Here we go."
Skulduggery relaxed the air pressure, opened the door, and pulled Oscar Nightfall inside. Valkyrie stuck out her foot, and Oscar stumbled over it and Vex shoved him to Ghastly and Ghastly punched him. Oscar fell down and didn't get up again. Skulduggery closed the door once more.