The Behavioural Analysis Unit heads to Chicago to examine a case where the culprit leaves red roses on their victims; Rossi's ex-wife pays him an unexpected visit.
Joel and Zoe hit a lot of frustrating snags as they try to remodel their home; Rose wants BlueBell to be sister cities with a town in France; Lemon asks George for help with a business venture.
Ray and the team face a crisis and devise a strategy to use art as leverage. Hector's wife plans to move, and he reaches a breaking point.
Four new residents begin work at the busiest ER department in the United States.
A dying FBI agent's greatest failure, allowing skyjacker DB Cooper to escape justice, becomes Nate's obsession as we flashback to the 1970s to solve one of America's great mysteries.