During dinner with Barnes, Kate hears from Nelson that the fire in Little Italy was arson. She will join him there to begin an investigation. Barnes will return to Annapolis and meet with Janet McMillan and get information on her husband. Thornton and Scarlett meet with Pearman to use his computer to eliminate suspects in the Pentagon spy ring. The Mercury is now in hot pursuit of a ship that may be helping Ursula escape. Learn more about your ad choices. Visit megaphone.fm/adchoices