Escape from transformation tower

You awake in a strange bed with no memory of how you got here. The bed is a four-poster bed with rich coverings. You start to look around. You are in a large, round room. The floor and walls are stone, but the floors have rich carpets in most places. There are two large windows on opposite sides of the room, both barred. The room has no apparent door.

Near the bed is a small table and chair. On the table is a plate with a domed cover. The smell of rich food comes from underneath.

On one wall is a large tapestry with a picture of a lady in a ivory dress with a beautiful unicorn on her lap.

You stand up. You find that you are wearing a rough linen shirt that comes to your knees and no other clothing. Next to you on the bed is a silk nightdress that a girl might wear to bed.

You walk around the room. You find a wooden chest, but it is locked. At the window you find a short inscription:

"Welcome, sir, to the tower of desire. None come here but that their secret wishes can be fulfilled. But beware: not all is what it seems, and leaving may cost you that name with which our greeting began."