First of all, great storyline, Booker has to face his past (seeing him walk around the chapel again is one of the best moments of the entire show!) and struggle with the present. When Hoffs get injured and Booker has to deal with a notorious gang which try to hunt him down, no real fan will switch away.
Again, we have guest appearances from 21 Jump Street: Steven Williams (as the ever-so-stern Captain Fuller) and Holly Robinson as Judy Hoffs (I guess some of the girls watching this show are envy about the close relationship between Booker & Hoffs, but it fits just perfect to me). Don Cheadle did a great job as gang-leader Frenchie Sayles, and I recommend everyone should watch the top-notch final scene of "The Pump", Grieco and Cheadle show some fine display of acting here. I also like to mention the rather unknown Michael Alldredge as the old cop "livin' on the pump", he did a fine job, too.
If you like Booker, make sure that you don't miss this one here. 9/10.