Don uses Charlie and Megan's expertise when the FBI is called to the scene of a federal judge's wife's murder, on the second season premiere.

Dylan Bruno stars as Colby Granger, a new Los Angeles FBI agent whose tour of duty with the Army's Criminal Investigation division allowed him the chance to see the world beyond Boise, Idaho where he grew up.

When a judge's wife is shot and killed, Don and his team look into the judge's cases to determine if one of his verdicts led to the murder. Using the judge's past rulings and Megan's expertise in profiling, Charlie creates a mathematical theory to identify the two most probable suspects from the case files. However, when the team discovers a link between the 2 suspects, the investigation goes in an unexpected direction.