The Ransom
In the only episode of the series in which the IM force isn’t sent on a government-sanctioned mission, they’re forced by a criminal named Egan, who’s kidnapped the daughter of a friend of Briggs, and want the IM force to capture a heavily guarded witness in a trial against him. They know Egan plans to kill the witness, but Briggs is put in a tight spot, and is determined that Egan won’t get a chance to kill the witness.