Revenge and Remorse (The Guilty Alibi) (S01E04)

Frank delves into the courtroom of a district judge that has been rigged with a devastating explosive. Their prime suspect is a recently released ex-con known for previous bomb threats. When Frank and Ed interview the ex-wife of the suspect, they find her more focused on her own fundraising efforts than the potential danger posed by her former spouse. Further investigation reveals that the suspect is involved with a showgirl who seems to have a solid alibi. However, Frank and Ed can't shake the feeling that she might be protecting him instead.