Reconnaissance

You'll need to closely inspect the guard's shift to make further progress. You'd feel bad, but they stand between you and The Lantern. So…

Guard's name: Caesar
Shift: 22:00
Predictable: Takes the same path through the displays (which seem to be inside jokes and have no bearing on my mission)
Thorough: Leaves no tile unguarded
Efficient: Never walks through the same tile twice