In Plain Sight Season 3 Episode 8 (In Plain Sight s03e08) with title “Son Of Mann” airs on Wednesday, May 19th 2010 at 10:00 pm via USA.
Here is summary for In Plain Sight Season 3 Episode 8 :

Marshall deals with feelings of inadequacy when working with his dad (Geoff Pierson), who visits Albuquerque to round up fugitives with outstanding warrants. Meanwhile, Brandi returns home with an odd explanation for her disappearance and a guest in tow.

Few hours after original series aired on TV, online streaming video for In Plain Sight Season 3 Episode 8 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.