Plot summary
When a possible witness to a double homicide is arrested, Jane goes undercover in prison to get information from her so the team can track down the murderer. After solving the case, Jane inquires about an FBI instructor job that was offered to her while at Quantico. Sharon Gless, known for her role in the 1980s female buddy cop show Cagney & Lacey, appears as a guest star to celebrate the show's 100th episode.
Credits
Adapted from Wikipedia contributors, List of Rizzoli & Isles episodes. HTML formatting and reference markers removed.