" I could search for the tunnel. I know how to hide myself with magic; the sentries would never see me.”
“Perhaps,” murmured Nasuada. “But I still don’t like the idea of having you or anyone else running about. The likelihood of the Empire noticing is too high. What if Murtagh is watching? Could you fool him? Do you even know what he is capable of now?” She shook her head. “No, we must act as if the tunnel exists and make our decisions accordingly. If events prove otherwise, it won’t have cost us anything, but if the tunnel is there…it should allow us to capture Dras-Leona once and for all.”
“What have you in mind?” asked King Orrin in a tone of caution.
“Something bold; something…unexpected.”
Eragon snorted softly. “Perhaps you should consult Roran, then. "

― Christopher Paolini , Inheritance (The Inheritance Cycle, #4)