Two Canterlot brothers are completely different in personality and motives. One is law-abiding and has a stable job as a Royal Guard lieutenant. The other is deceptively cheerful and is the leader of an underground guild of professional thieves. The Royal Guard lieutenant doesn't know about his brother's involvement in the very thing he is supposed to bring down. So what happens when a raid to exterminate the guild leads to one brother discovering the other's illegal occupation, leading him to a fork in the road -- arresting his sibling and performing his duty or allowing the master thief to escape unscathed because of the blood bonds they share?

(More character tags will be added when said characters enter the story. I do not own MLP.)