Heya, can you show a screenshot of your questlog or give a bit more info? I'm not 100% sure which mission you mean exactly. There's 3 different abandoned houses throughout the game.
The abandoned mansion, im not currently home, but I know of the abandoned house that has a secret door under the bed, where you come out from at the start of the game, and I know of the other abandoned house in carceburg. So im looking for the third one.