The teachers are back at Willard R. Abbott Public School fordevelopment week, a time to prepare for the upcoming yearbefore the students' first day of school. Post-breakup, Janineis determined to start the year off right and leave herproblems at home. With this new outlook, she takes onorganizing the faculty mixer and announces a special celebritysurprise she planned for the kids' first day. Meanwhile, Avaruns a side hustle out of the school parking lot and Gregory,now a full-time teacher, is in over his head with thecurriculum.
It's been a few months of relative peace in Helena, but allthat's about to change when Sunny Barnes and her family set upSunny Day Excursions just outside of town. From the moment theyarrive, things begin to go awry, with Cassie being called into investigate a missing backpacker and the new sheriff intown, Beau, partnering up with Jenny to track down a murdereron the loose.
Still reeling from the death of informant Anna, Voight faces anew threat as he tries to keep the neighbourhood clean; newwrinkles develop in the Upton, Halstead and Voight dynamic;the team gets a new chief.
When Padma's pregnancy takes a dangerous turn, the doctorscome together to find a solution and turn to Ian to perform amiracle. Meanwhile, Conrad makes a decision regarding his lovelife and Devon leads his own clinical trials at Chastain.