S1, E7: After two teens are found murdered, the investigation leads Don and his team to uncover a dangerous counterfeit money ring. Charlie is called in to use his mathematical expertise to pinpoint the location of the counterfeiters by analyzing the dispersion of the bogus money. In the process, he also discovers a surprising connection to the disappearance of a local artist. Meanwhile, Charlie realizes how little he knows about his brother when he meets someone from Don’s romantic past.