Crouching & Thievery: NPCs can't see you if you're crouching
|Component:||NPCs and Merchants|
It seems like if you are indoors, in dark lighting, that NPCs cannot see you if you are crouching, even if they are stairing at you. This allows you to steal things in front of their face, even in front of large groups of people. I'm not sure what affects this but it makes stealing items much much simplier.