I am intrigued to know what sort of job you do nat! You say you do hardly any work, you are on a pretty decent wage and got a pay rise after 3 months. Not meaning to be rude, but how can any company justify keeping you in this job?
As for office secrets, I have been in the situation many times where things have been difficult because people have confided in me. In fact, I had to pretend to be surprised yesterday when a management change was announced that I already knew about.
Is you boss approachable in the sense that you could ask him why he put you in this difficult position?