With only that as a character concept, I would start with a rogue with high Dex and Int. Put lots of skills into things like Escape Artist, Move Silently, and UMD. For higher levels, the Shadowmaster PRC should be the goal - Hide in Plain Sight and Shadow Jump should meet the character concept very well.
Note that both Shadowmaster and your character concept are great for characterization, but low on the combat capability. You might want to spend some time working on the secondary traits and pick the base class from there. For starters, is he an escape artists as a trickster or as a showman (rogue or bard)? Is he focused on using his body or using any magical means necessary to escape (monk or wizard)?