Path to the Stars

-Dear Miss Constantine -Lord Ho was being really attractive and persuasive that night-, I don't need to confirm the importance of that key, 'The Path to the Stars'. Let's say that it's really vital to my interests. If you get me that legendary artifact, I will guarantee you unlimited access to the library of the Order of Exilia. All the ancient knowledge, treasures, mysteries, mythical formulas... Everything will be at your disposal. Just bring me the key of citrines. It opens a carved door down the catacombs of Notre Dame. Nobody knows about this door, but you and me will be witnesses of a miracle.
I accepted, of course. And after five months of hard inquiries and persuasive methods, yes, I got the 'Path to the Stars'.
But...
But there was a little problem:
Keepers of the key told me that "joke":  Now I was the new guardian of the key, and my mission was: "Never ever let anybody open the door. The Path to the Stars must be always closed. That is the most important thing in this world".
So yes, I have a problem. Lord Ho is waiting for me in Exilia. He will open the carved door at any cost, but something inside tells me that the ancient keepers were right. What can I do? The train is arriving at the station and the key is shining in my hands with a mischievous glint. I have very little time...
Oh, yes, I have the solution...:  my friend Zola. I will send her the key. She will keep it safe forever.

(Lady Kei Constantine diaries)