"And how did you come to be here, all by yourself," she almost coos, dusting the snow from his hair and smoothing the curls.
"Of course they are," says the witch. "There are more of them at my home. Perhaps you would like to come with me to see it."
"Dear nameless child," says the Queen. "I think perhaps I should like to call you Winter."
"Do tell me anything else there is to know about my new favorite," she purrs. "For that is what you are."
"And stay here you shall," pronounces Jadis. "In time perhaps you will forget him completely. What was the obstacle to his death?"
"You must never allow that to stop you when someone needs to die," says Jadis. "Many ancient things will fall, when pressed."
She smiles. "Perhaps you should like to learn a thing or two about putting one's enemies to death, and help me with a few of mine."
"Excellent. You shall have the finest weapons, and you shall be my assassin," says the Queen.
After something like half an hour, they arrive at her home, a castle so pointy it looks ready to carve great rents in the sky surrounded by a garden of stone creatures in postures combative or terrified, and she and Winter dismount the sledge and the dwarf takes it and the reindeer to put them away, and she begins issuing orders to other assorted minions of all shapes and sizes except human. She commands quarters prepared for Winter, and a suitable assassin's livery, and arranges lessons for him with the quartermaster, and instructs a specter of some sort to conduct him on a tour of the castle.
The specter shows off halls of statuary, and the throne room, and where he will be learning to stab and club various sorts of the Queen's enemies to death, and the dining hall where she eats with whoever is favored of an evening, and the servants' quarters, and the chamber where he will be staying "so long as Her Imperial Majesty allows", and a vault of treasure which is quite easy to open and look inside, but of course all of the treasure is surrounded further within the vault, by a wall of magic, which prevents any light-fingered servitors from absconding with it. Winter is not shown the Queen's personal chambers, but there is plenty else to see.
He is violently thrown back, clear through the insubstantial specter and against a non-magical wall, and his hand smarts with electricity.
"Come, you have yet to see the dungeons," the specter says, and it shows Winter the dungeons. They are not well-populated, but there are a few creatures here - a Badger, a Dryad, a unicorn with her horn sawed off - who are locked away in the hopes that they may yet break and disclose information to their captors.