After a U.S. intelligence negotiator goes missing and her ransacked Paris apartment is found to be covered in her blood, the team are on the clock to find her before the country's nuclear secrets fall into the wrong hands.
Benson tries to help a student after she's assaulted on a field trip. Fin suspects a witness in the case may not be telling the whole truth.
Danny and Baez investigate the disappearance of a journalist who was writing an exposé on an innocent man jailed for murder. They look over the original case in hopes it will lead to her being located.
As Sherlock investigates an explosion that killed two people, he uncovers a crime that has been dormant for years. Watson wants Sherlock to choose a sponsor.
Alicia's future is uncertain after she is forced to resign as state's attorney. Elsewhere, RD hires Cary and Diane to argue against conservative lawyers in a test case involving mandatory minimum sentencing.