Sands, Agent of Morra

S1, E16: When Sands (Colin Salmon), Senator Morra's deadly representative, enlists Brian's help to eliminate an immediate threat he needs to keep secret from the politician, Brian learns Sands' dangerous and shocking past. Also, Brian's sister, Rachel (Megan Guinan), scrambles to cover up his abrupt side mission with Sands when the FBI can't reach him regarding a new case.