Crack Auction Sentry 3.0.9 Horizontal Crack In The Wall, From The Floor To The Ceiling - Is It Serious Problem?

Horizontal crack in the wall, from the floor to the ceiling - is it serious problem? - crack auction sentry 3.0.9

Looking to buy a flat. I went to a crack in the wall of the room - see horizontally. It runs all the way from floor to ceiling. Do not meet in the middle of the wall, but the angle of 90 degrees at 2 walls. And works at an angle to the side where the wall meets the ceiling, about 1 meter.
The ground-garden is a ground floor flat in Victorian building, brick walls. There are a total of 5 floors and the ground floor, 1 and 2 Stick. The building is constructed on the road, very steep. I thought that the wall may be moved in the past, because the building is built on the hill and the ground is not uniform.
Is it possible that this does not mean cracks in the plaster that the problem is more serious?
The seller told me that the only cracks in the plaster would not be possible to put a floor on the market if there will be a serious problem, you should be on the auction ... Is that true? #

No damage to water and light on the wall in the living room. Not sure if this has something to do withwith crack, moisture in the plaster ....


I want more than you know to think before wasting money on the investigation of the structure.

Thank you in advance.