The BEST episodes directed by Peter Ellis (Ii)

#1 - Dark Matter

Numb3rs - Season 2 - Episode 19

Don and his team investigate a school shooting. He learns two students could have a strong motive, so Charlie uses the school's radio frequency identification system to track the shooters' movements through the school's hallways. When Charlie detects an abnormal pattern, the agents take a look at the evidence and discover a third participant no one had suspected earlier.