My name is Chen Mo. I'm a locksmith who only takes night jobs.
Since my father went missing, I keep receiving strange orders at midnight: an apartment numbered 404 that was demolished eight years ago, an old alley that can't be found on any map, addresses left behind by people who have been dead for years.
Whenever I arrive, the toothless copper key my father left me grows hot. If I insert it into the keyhole, I can hear the last words spoken inside before the door was locked.
Some people cry for help, some plead for justice, and others warn me never to open the last door in Echo Alley.
But my father's voice is right behind that door.
As the whole city forgets certain people, I have to decide: should this key open the door, or seal away every truth?
