Saving Grace Season 3 Episode 15 (Saving Grace s03e15) with title “So Help You God” airs on Monday, May 31st 2010 at 10:00 pm via TNT.
Here is summary for Saving Grace Season 3 Episode 15 :

With the celestial Earl in her corner, Grace must answer to a higher authority and deal with the judgment of her past behavior.

Few hours after original series aired on TV, online streaming video for Saving Grace Season 3 Episode 15 usually available on Net and of course, if video available, as soon as possible will show you where you can watch this episode for free.