Prime Suspect is the fifth episode of the first season, and the fifth episode overall. It was released on February 18, 2005.
A genius' daughter is captured by two men looking to use his possible solution to a 150-year-old math equation for daylight robbery, making Charlie's input even more essential than usual.
Neil Patrick Harris
The issue of prime numbers is a key one in this case.
Ironically, given the theme of the episode and Ethan Burdick's research, none of the opening numbers (203,900; 90%; 56%; 48 hours) are prime numbers. The episode number (5), however, is.
The kidnappers go after confidential Federal Reserve data. When asked specifically what they are after the agent monitoring the break-in says that they are after the prime rate. While it ties into the episode title of Prime suspect and the episode's theme of prime numbers, the Prime Rate is NOT one of the rates that is set by the Fed.
[This appears on the beginning of the episode] 203,900 Child Kidnappings 90% Parents Responsible 56% Children Found Alive 48 hours Critical Window