Advance
Efficient Spies
Most peasants would happily sell their own mother for gold, but there are some with skills and talents that we in the government might find very useful for...ah, statecraft. Although finding these worthy commoners is difficult, through experience we are learning to separate the wheat from the chaff.
Advance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Discovery tree itself.
