Unlike the other episodes, where the agents try to find missing people, the agents interrogate two potential suspects (Definitely, assuming that one of them is the suspect they are looking for) before they lose the custody of them at this time.
Identical twins.. It can become a very interesting material for movies or plays, but after this episode, I realized it can also become a great excuse to blame the crime one did on the other one. I think the suspect(either Greg or Rick) is really smart when it comes to crime and baffling the agents. Look at his way of talking to Martin! And he finally provoked him into prematurely bringing up the unsolved murder cases, which were very important in the investigation to arrest him.
Anyway, the suspect succeeded in making the other one admit what he didn't even do, so he could set himself free. I think the conclusion of the episode was realistic even though the bad guy didn't get what he deserved.