In order to find the killer of an undercover narcotics cop, Jane and the CBI team retrace her investigation.

Jane and the CBI team narrow down the long list of suspects after a high-end divorce attorney, with many enemies, is killed on his speed boat. Meanwhile, Jane is questioned by Agent Darcy about whether Red John was responsible for Panzer's murder.

While a jury deliberates the guilt or innocence of a defendant on trial for murder, Jane tries to prove she has been wrongfully accused before time runs out. Meanwhile, Summer may have gone too far when she helps Cho make a case against a suspect.

Jane and the CBI try to narrow down the list of suspects when a terminally ill man, is found murdered. Meanwhile, Cho is forced to face his demons.

Jane and the CBI try to find the killer of a man found outside a cabaret featuring female impersonators. During the investigation they discover a list of suspects, all of whom bullied the victim. Meanwhile, Cho and Summer hide their relationship from Lisbon.

While investigating the murder of a surfer, Lisbon reconnects with her former fiancé, Kenny Johnson, who she hasn't seen in over a decade. Also, Cho questions his decision to be in a relationship with Summer.

The death of a young botanist leads the team into the lucrative world of medical marijuana, while Cho’s work with the rapid response team brings him back into contact with Summer.