Ep 11. Scratch

In the Numb3rs season 6 episode titled "Scratch," the team investigates a string of home invasions in the upscale neighborhood of Westwood. These burglaries, however, are different from the usual break-ins, as the masterminds behind them seem to be able to get into the homes without setting off any alarms or leaving any trace of their presence.

Charlie (David Krumholtz) uses his mathematical expertise to piece together the clues found at the crime scenes and comes up with a theory that the burglars used a sophisticated algorithm to analyze the security systems of each home. This enabled them to find the weakest point of entry and avoid detection while they carried out the theft.

As the team delves deeper into the case, they discover that the burglars are a group of former hackers who have turned to robbery as a way to make a quick buck. The leader of the group, known only as Scratch (played by Dominic Monaghan), is a genius who can crack almost any system in seconds.

Scratch proves to be a formidable opponent for the FBI, as he constantly outwits and eludes them at every turn. Even Don (Rob Morrow), the head of the FBI team, finds himself unable to keep up with Scratch's cunning and ingenuity.

As the investigation progresses, the team realizes that the burglaries are just a cover for a more sinister plot. Scratch and his group have been commissioned by a shadowy figure to steal a piece of technology that could potentially be used as a weapon. The FBI must race against time to stop Scratch and his cohorts before they can carry out their plan.

Meanwhile, Charlie's personal life takes a hit when he discovers that his mentor and former professor, Dr. Millie Finch (played by Sela Ward), is being investigated for academic fraud. Charlie must decide whether or not to continue working with Dr. Finch, who has been instrumental in his career, or to sever ties with her in order to preserve his own credibility.

As the episode reaches its climax, the team engages in a tense stand-off with Scratch and his group. The outcome of the confrontation will determine whether or not the thieves will be brought to justice and if the FBI can prevent the technology from falling into the wrong hands.

Overall, "Scratch" is a thrilling episode that showcases the show's signature blend of high-stakes drama and cutting-edge mathematics. The episode also presents a compelling exploration of the theme of loyalty, as Charlie must grapple with the ethical implications of standing by his mentor, while the FBI must remain steadfast in their commitment to stopping the criminals, no matter the cost.