The cause of the problem was not 'immediately' clear. [=is was not known right away]
They live in the house 'immediately' [='directly'] behind this one.
We need to leave 'immediately'. [='at once', 'right away']
(..) Father, Son and Holy Spirit Vincent, our name is not on the list. Write it in. Mancini. M-A-N-C-l-N-l. - Problem? - My name isn't on the list. - Then you have to leave immediately. - You want to dance with me? Joe, it's Vinnie. These are our guests. I'm sorry. I'm sorry, sir. Welcome to the party. (..)1990 The Godfather Part III