My story centres around a character investigated a conspiracy that, as it turns out, goes right to the top. The scandal is to do with banks, inspired by the Libor manipulation and everything that's happened recently, but beyond that I haven't really developed this. I feel like I know enough that I could make one convincing, but I don't really know where to start with actually creating a conspiracy from scratch. As the character is only investigating it and so will only be scheming round the edges it's not necessarily important for the actual story writing, but I would like to plot one out to make sure it makes sense and make it more believable. Does anyone have any experience with this, or any pointers about where to start? Thanks.