Hiding Place with a Whirlwind

From: Martha
Description: Thank you so much! You've found all of the amazing and paradoxical items into which I disassembled the box containing the memories I wrote down during a trance. Now I can combine these constituent elements and finally learn what happened in the House with Red Windows. But I'm still too weak after the ordeal I experienced on the astral plane. Please help me by bringing a few City artifacts so I can get my strength back.
Completed: Incredible! You must be a bit of a sorcerer yourself. Look! The artifacts are vanishing, but the items vyou've collected are starting to glow and spin around as though they're caught in a whirlwind! The whirlwind is dying down... there's a box made of mirrored black glass and decorated with gold filigree on the table. Give me the Key to Childhood, the Key to Adolescence and the Medium's Key. Thank you again. I'm opening the box. The keys have disappeared, and there's a folded piece of paper in the box. At last!