Three random people are all shot by the same man. With so little evidence to go on, the team is stretched to the limit forcing Jack to take drastic actions in order to catch the sniper, actions that could put his life in danger.
Sue and Lucy dig up an old case concerning a young bank teller who was shot. However, with so little evidence, the girls find it hard to make any progress. In the meantime, the boys film their on-line videos for an upcoming bachelor auction.
When the F.B.I notice some unusual phone calls between possible terrorists and D.C citizens, they decide to do some surveillance. In order to remain inconspicuous, Sue and Jack pose as a newly married couple and move into the house next door to the suspects.
The team continues their investigation believing that the suspects intend to spread the bubonic plague. With Betty as their only hope of catching the criminals, the team races against time to stop them in their tracks.
When an acquaintance of Sue's sees who she thinks was a concentration camp guard in World War II, Sue begins to investigate, looking for the man with little evidence to go on. Meanwhile, Myles, Bobby, and Dimitrius battle against Randy over travel expenses.
Sue meets Jack and Bobby's FBI Mentor when he brings the team in on a case to sting a North Korean terror group - but Sue discovers that things are not as they seem. Meanwhile, Lucy reconnects with her old high school love - with surprising results.
Sue and Dimitrius put an operative in the field to take down an illegal arms sale - but when the encounter gives them a chance to land an even bigger fish, Dimitrius goes undercover as the bait. Meanwhile, Dimitrius wife Donna has some unexpected news of her own.
Sue and the team must infiltrate a Chinese drug-smuggling ring, requiring Bobby to go undercover at the gang leader's nightclub - as an Elvis impersonator. And Sue learns that her friend Troy has an estranged brother - and that the estranged brother has a secret.
When the members of a think tank are found shot dead, Sue and the team track down the sole survivor - but is he a possible future victim or the murderer? By accident, Sue ends up in the fleeing man's car. And Sue teaches Levi some new tricks - or maybe he's teaching her.
Investigating a 5-year old murder, the team automatically links the killing to a group of drug dealers, but further investigating draws them towards another killing that occurred just months before the first. Meanwhile, Myles attempts to improve his neighborly relations.
In order to solve a case involving two men shot with the same gun, Sue and Jack go undercover to the law firm that the two men both worked at. With Myles' sister also working at the law firm the agents get deeper and deeper into the facts of the case.