Plot summary
Upset that his son is back in rehab, Conrad demands that Mexico extradite a major drug cartel leader, despite Russell and Elizabeth urging him to take a different approach. During the extradition, the cartel leader is released and 21 federales are killed. With information gathered by a journalist who has been murdered, Elizabeth's team confirms that Mexico's foreign minister is working with the cartel leader. The US provides intelligence to Mexico that results in the foreign minister's arrest and the recapture of the cartel leader. Henry's team identifies the senator who is giving classified information to Russia. Blake's parents visit and pressure him to take a private sector job. Elizabeth tells Blake that she believes he has potential for greater things, so she plans to fire him in a year, giving him that time to decide what he wants to aim for. Dmitri and Stevie start dating.
Credits
Adapted from Wikipedia contributors, Madam Secretary season 4. HTML formatting and reference markers removed.