Worked out my Smartest Man build to the earliest level I feel it works on.
Slayer 1 | Swashbuckler (Inspired Blade) 1 | Investigator (Sleuth/Empiricist) 2 | Brawler 1
Gets, Int to Panache/Luck, Disable Device, Perception, Sense Motive, Use Magic Device, Diplomacy to gather information along with...