1.) I second GR PHB at the bare minium.
2.) If you have some patience, I'd suggest looking over Spycraft 2.0 and using the Master Conversion document to do the Ritual Magic for occult powers. I'd suggest using the Campaign Qualities to tweak the game to be darker and grittier.
2.) If you have some patience, I'd suggest looking over Spycraft 2.0 and using the Master Conversion document to do the Ritual Magic for occult powers. I'd suggest using the Campaign Qualities to tweak the game to be darker and grittier.