To get the best ending on this game what you have to do is on the last level when you have to defeat the JBA when you reach the last floor where the bomb and where the JBA boss is (Forgot his name) kill the guards and then run upto the boss and knock him out, defuse the bomb then you should end up on another level with Carson Moss and his guards, on this level get to the bridge and use your lock pich then your hacking device (bear in mind you only have about 10:00 mins to complete the level) after you hack the bomb go out of the bridge door and Fisher should jump of the boat.