Don and his team investigate a rash of deadly restaurant robberies

When a multi-million dollar racing yacht sinks during a race, Don and his team are called to investigate after the treasure hunt to find the wreckage turns deadly

Don and his team search for the fundamentalist leader of a polygamous sect who is on the FBI's most wanted list for committing numerous crimes, including rape and murder

During the murder investigation of a state senator, Don and his team discover a plot to exact revenge on the individuals involved in a government sponsored behavior modification project

Don and Charlie try to catch a serial killer who is seeking revenge against Internet sexual predators who prey on young girls they meet in chat rooms

The team uncovers a conspiracy of embezzlement and bribery which may be connected to his death. Meanwhile, Charlie prepares to meet Amita's parents for the first time, on NUMB3RS, Friday, May 9 (10:00-11:00 PM, ET/PT) on the CBS.