"This wish is easy to grant," they say. "There is another like yourself still in this house. This mortal knows how to escape the house. However, there are two ways to leave: one with treasure, one without. This other only knows one way. We do not know the remaining method, but know you can escape with either. Also, there is a book somewhere near a modest grave: it may aid your exit. This may not be known to the other."

They pause for a second.

"There is a trapdoor in this room, leading to an attic. There is a false path; false treasure - as well as a way down leading to disaster, unless approached with knowledge. There are paths and paths, then water. It is a way of escape, but only when in danger, and only with clarity. There is danger in this room too. Ascend first - but know that not all secrets of this house are known to the other."

They start to appear less solid.

"Good luck, mortal! We wish you well! Goodbye!"

You blink, and suddenly, you're all alone in the room. You look around, and see a few options for your next move.
Directly behind you is a very solid locked wooden door - clearly, it's a mechanical lock, but won't open without the key.
In front and to the right is a large box with a circus lion painted on it.
Far to its right is a trapdoor in the floor.
Above you is a small cord, which you assume must open a way to the house's attic, as your inquisitors suggested. If they weren't lying. Where to now?