The BAU investigates a series of murders in Modesto that appear to be connected to a killer who jumps trains in Northern California and chooses his victims based on their proximity to the railway.
Robert enlists the help of a musical icon to fend off Kitty's bout with cold feet; Nora reconnects with a man from her past; Sarah has mixed emotions about agreeing to have dinner with a new business consultant; Tommy is overwhelmed by guilt when Sarah and Lizzie return home; Justin pursues a new romance with someone with questionable intentions.
Natalie becomes convinced a critic (Guest Star Dylan Baker) who panned her daughter Julie's theatrical performance was responsible for a murder at the same time as the show.
Becky is working double shifts and taking classes at the community college, resulting in less time with her daughter; Dan decides to foster an elderly dog.
Darlene learns some shocking news about an old friend; the Conners come together to help someone who is close to them.
