Mac joins forces with special agent Jack Dalton to recover a missing bioweapon and save hundreds of thousands of lives.
The team investigate a decapitated corpse that is connected to Voight's social circle; Roman makes a terrible mistake.
Mac and the team look into the death of a CIA supervisor. The case leads them to a corrupt CIA agent and an expansive counterfeiting ring.
Rayna seeks the help of a music producer to change her sound. Meanwhile, Juliette goes on a date with a squeaky-clean NFL player to improve her image.
Rayna is comforted by an old friend after telling Maddie and Daphne about her plans to divorce. Meanwhile, Juliette reinvents herself and Avery considers an attractive offer.