The Eagle and Talons
The Eagle will be hidden and his allies will not give up his whereabouts easily. The players will have to flush him out and will have chances to do that in events and role play by revealing his Talons, his closest agents. There are five talons in all but only three need to be revealed and dealt with to expose the Eagle, going above and beyond will make it easier to deal with the Eagle.
The five Talons are known as the Raptor, Predator, Hunter, Stalker, and Killer. When a Talon is revealed the players will have to decide if they wish to kill them, turn them, or capture them, this will be done through a poll. Killing a Talon is the simplest task but they lose any intelligence the Talon could have provided. Turning them can yield the best intelligence but they could also betray the players and capturing the Talon will provide basic intelligence to track down the Eagle. When a Talon is killed they yield no intelligence but will flush out the Eagle.
If three Talons are dealt with or killed then the Eagle will be revealed and the players will have till Day 10 to deal with him before he goes to ground and evades capture. Even after the Eagle is revealed the players can still continue their campaign against the Talons if they wish to gather more intelligence or better their odds.