The Tenth Justice by Brad Meltzer
A Washington-based thriller about four ambitious twentysomething housemates, fresh out of college, eager to make their mark in their chosen careers. When one of them, Ben Addison, is tricked into leaking a Supreme Court decision on an important corporate merger in advance, he lands them all in big trouble. They resolve to get even with the man who set Ben up. But is there a traitor in the camp?