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']
(..) God damn it. I told him not to touch a thing until I was present. My instructions were exact! Put him on the telephone immediately. Nigel: Sorry, sir, but he stayed on the island and sent me to the mainland to contact you. I will leave for the island (..)2009 The Black Waters of Echo's Pond