The Shadow is a Specialization of the Sentinel Career.
Individuals who are able to operate outside the constraints of a governmental system can sometimes achieve practical resolutions by making use of resources and techniques that step outside of what might be legally permissible. Characters who willingly engage in such actions— acknowledging that the best solution may not always be the most acceptable one—follow the Shadow specialization. Shadows acquire Knowledge (Underworld), Skulduggery, Stealth, and Streetwise as additional career skills. Shadows firmly believe that their ultimate accomplishments more than justify the tools that they must use.
The Shadow can be found in the Force and Destiny Core Rulebook.