You go around the map trying to find all three pieces of intel. When you pick up one, you become a spy, and everyone else is your enemy. When you get all three pieces of intel, you become the super spy, with all the super weapons, like the rocket launcher and the mini-gun. You have 500AP as well I think. When you are a super spy, you must load the intel onto a machine in a specific location before everyone else kills you. And when there is a super spy, it's sudden death, so no respawning after you die. I hope this answers your question.