Elizabeth tries to secure democracy in Haiti without depending on military action, after the country's president refuses to let go of his seat after losing the election.
As Peter and the city of Chicago prepare for a possible riot, Frank Prady and Alicia face each other in an important debate.
Holmes and Watson are called to investigate a bioterrorism attack at the precinct, where Detective Bell is one of the victims.
The team races to prevent a deadly terrorist plot from coming to fruition with the assistance of Reade's journalist girlfriend.