Don and his team work to track down a serial rapist who is using his position as a police officer to lure his victims and commit unspeakable crimes.

Meanwhile, Larry asks Amita to work with him on a new research project.

TRIVIA: CASTING CALL!

Numb3rs is looking for male background actors to play members of several hip hop / entourage / groups during the next episode of Numb3rs due to start filming on April 16.

They are primarily looking for African American, Hispanic and Caucasian men with great Hip Hop wardrobe and looks. These roles are open to SAG and non-union actors. Some may work as Hip Hop studio engineers. Can't wait to see this one!

10.00PM WEDNESDAY / MAY 7 2008 on TEN