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A pair of twins are killing people who rub them the wrong way. One of their victims is a Federal Witness, which brings an FBI agent, who thinks that one of the people he testified against lashed back. Chris finds herself fascinated with the case, which causes more friction between her and T.C. Chris suspects that they have a serial killer and the agent is impressed with her, that she requests that Chris help her, which makes T.C. unhappy. When a person who saw the twins in one of their moods tries to call Chris but is not around so T.C. takes the call. The twins kills him and when T.C. arrives they tell him that the one who called him went away. Bobby who thinks that something is wrong and who thinks that T.C. is letting his problems with Chris cloud his judgement, tells the FBI agent about the twins and the agent says that it's been theorized that the killer is more than one person, and the twins could be it. One of the twins lures Chris into a trap but Chris escapes and when one of them tries to kill her T.C. arrives in time to save her. Chris accepts an offer to go train with the FBI in Quantico and tells T.C. that she doesn't want him to go with her. Add a recap »