FBI-agent Don Eppes (Rob Morrow) har et hemmelig våpen i sin yngre bror, Charlie (David Krumholtz), et mattegeni som bruker ligninger til å løse forbrytelser.
While on the hunt for a serial letter bomber, Don and Charlie disagree over whether a suspected bomber, who had eluded conviction years earlier, is the person responsible for the latest murder.
S3E320 40 min
