After entering the opera building you stumbled upon a big metal door. What would be behind it? There are also 2 companion cubes, better to keep them close to you.

For the full "Into the opera" serie: http://steamcommunity.com/sharedfiles/f ... d=71854336

Click here to download Into the opera II - Hallway

Pretty quick and easy....the fling to the top of the stairs can be a bit tricky but you only need to make it once.