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']
(..) - Oh, he never stops. Do you know Ser Hugh of the Vale? Not surprising. Until recently, he was only a squire - Jon Arryn's squire. He was knighted almost immediately after his master's untimely death. Knighted for what? - Why are you telling me this? - I promised Cat that I'd help you. (..)2011 TvShow: Game of Thrones Title: Cripples, Bastards, and Broken Things Season: 1 Episode 4