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']
(..) And now our numbers are even fewer. - He's one of them. - He's a traitor. - I can't believe he's doing this. Everyone needs to lay down their weapons immediately. - Traitor! - He's not one of us! This is treason! - You're a puppet! - Hang him! (..)2014 The Hunger Games: Mockingjay - Part 1