Leslie is forced to deal with a former beloved colleague-turned bitter enemy when a neighboring town separates a shared park with a fence. Meanwhile, Ron fears the worst when Leslie finds out about his birthday.
Charlie finds success as a children's singing star, which makes Alan miserable.
The Johnny-Kaitlin-Marissa-Ryan situation finds closure, perhaps, and tragedy for sure. Summer may be running out of forgiveness for Seth's half-truths.
Doug and Carrie search for new friends, who do not have children; Arthur rediscovers a breakfast cereal from his childhood.
When a frazzled mother bursts into the Philadelphia Police Department claiming to know who might have killed her daughter at a 1968 debutante ball, Lilly reopens the case.