Thorn leads Alendi into a room which is not a library. It contains a mat on the floor, a bowl of water, and a shuttered window; the walls are seamless wood.
"Sit," Thorn tells Alendi.
Thorn smiles. He has sharp teeth.
"Stay here. Think very hard about how I can seamlessly send you to fetch Promise securely without unwelcome wrinkle or unplanned contingency. If anything happens which requires prompt attention lest you die or be otherwise lost to me, such as you biting off your own tongue as a result of your very much operative standing order, tap on your door twice. Someone will attend to you; they will be authorized to kill you in whatever way is most convenient or amusing for them if that seems more expedient than saving your life."
And Thorn goes out of the room and shuts the door.
Come to think of it, he's been gone longer than he expected to. And Promise can't do the trick about not eating. She's probably already gone to Fairyland. But she did want to change things in his Empire, so she'll probably be back, and he does know where the gate is.
Assuming she's on Scadrial, she'll probably be nearby so she'll know when he gets back. She does have tin, but won't be immediately using it because she'll know it's him when he opens the door. Unless she was expecting Thorn to send him back, in which case she might flee anyway. But if she does, she can't feasibly escape. His magic beats sorcery even when he isn't on his own world.
He concludes that he'd capture Promise easily if she's in Luthadel, and not catch her if she's not, and nothing he or Thorn or Promise can do will change that.
I more or less told Promise to run my empire while I was gone, so I will be able to find her. I can't guarantee that she'll be on my world when I arrive—I've been gone for days so she has probably been going to Fairyland for food if nothing else—but she'll be spending most of her time in my capital. If she's not there, she will be soon. Days at most.
If she has run off then I can't get to her, but I don't think she has. And if she hasn't, I'll find her."
"Good," says Thorn. "Your standing order about what you should do if you intend on extraneous actions is in place with the caveat that if it is activated you should also do your utmost to return to one of my courts, whichever you can reach fastest, and present yourself to the highest ranked sorcerer present. In the hallway you will see a green fairy by the nickname of Harp. Harp will escort you to the court you came from; do whatever she tells you and cooperate with her entirely, including by way of conversational honesty and disclosure, until you have heard from me, Blossom, or Twirl differently on this subject. From there, go back to your world, seek out Promise at once, secure her such that she can present no threat to me or mine nor escape, and bring her back to hand over to Harp, who already has her name. If she is not there when you arrive, you may perform any but only those maintenance tasks which you expect I would fully approve if you explained them to me with no omissions, tricks, or exploitations of ignorance, which you have time for before she appears within capture range. If within the next eight days she does not appear, return to Harp for an update in your instructions."
He doesn't remember mentioning that being one of the tricks he can do, but someone could have asked Verve. He cancels his weight. "Ready."
"My world is a sphere instead of flat like this one, and my city is at the northernmost part of it. There's a ring of six mountains spewing ash, the city you're looking for is east of the seventh in the center. The river Channerel goes through the city, and my palace of Kredik Shaw is at the center of the canal system."
He goes behind the waterfall into the cave, and through the gate. The door unlocks and opens.
"Stop."
And Promise shoves past Alendi into the room with the gate and closes it.
Alendi stops. Again. He turns into the seven-hundred-year-old version of himself, and he can't breathe and will probably die in a matter of seconds, but he's never been happier about being enslaved by a moron.
Yellow parrots this order. He looks tired.
"Tell him that all orders you didn't give him are rescinded," Promise says.
Yellow tells Alendi that too.
"Tell him he may not enforce any orders but that he may otherwise speak freely."
Yellow does that too.
"While you're at it, tell him he's an idiot."
"You're an idiot," Yellow yawns at Alendi.
"Tell him to obey me as though I were his master."
"Obey her as though she were your master," repeats Yellow.
"Now you can sleep."
Yellow tips over right where he's sitting. He drools.
Promise scowls at Alendi.
How'd you know Thorn was going to get me?"
"I spent a long time in his court! I have met him! I didn't escape, he got tired of my attitude problem! You didn't listen to me so I got Yellow's name and jailbroke him and have been keeping him awake ready to stop you as soon as you got back, hoping you'd be sent alone instead of with - I don't know, Rainfall, I would lose in a fight with Rainfall even on my turf."
"Speaking of that, Harp is outside the waterfall, and if she notices the cave doesn't contain a gate someone'll be here as soon as she can make another one. Otherwise I have eight days before I'll be missed."