Here is the basic plot (as I understood it)- some SPOILERS will naturally follow:
There are two main characters played by Saul Williams and Christopher Jackson. They used to be best friends, but have drifted apart. Saul just got out of prison (his second strike) and has decided to give up his drug dealing ways by taking a job at the local body shop.
While Saul was in prison Jackson has taken over the drug business in the neighborhood and stolen his girl (Saycon Sengbloh). At the start of the show Jackson's brother Benny is killed by this gang called the Four Fives because they want Jackson to pay them a $3000 cut of his profits. He's been refusing so they are going after his family to show him who's boss.
Tonya Pinkins, Jackson and Benny's mother, desperately wants Jackson to give up his criminal ways and go legit. Jackson and his gang/posse/crew have to decide how to retaliate for Benny's death and how to deal with the Four Fives in general.
Saul and Saycon are still in love and their romance is eventually rekindled. (We never really see Jackson and Saycon as a couple so this love triangle falls pretty flat.)
Eventually Jackson and his group decide they are going to confront the Four Fives in a big rumble type thing. (Hail Mary basically functions as the Quintet from WSS.)
At the last minute Saul convinces that peace is the answer and they shouldn't use violence to settle this dispute. Everyone seems pretty ok with this (!) and they all disperse.
Saul and Jackson go to the body shop (owned by a white guy who had built a car with Benny before his death) and they decide to become business partners and start a new legit life at the body shop.
Two members of the crew apparently weren't so satisfied with the rumble being called off and show up at the body shop. Saul gets shot and killed. All of their dreams are washed down the drain.
Marie: Don't be in such a hurry about that pretty little chippy in Frisco.
Tony: Eh, she's a no chip!