Mm-- after the letter we wrote master Blue told us to look into the heart, I decided to go try to locate it... I asked the room to show me the heart, and it became an empty wooden room, with nothing inside save for me. I was trapped there for several hours-- with the sound of a heartbeat from every possible direction.

[a sigh, there.]

That's when I first thought the room was the heart, but we've learned since that it... wasn't a good idea to enter it at all.