A wish-granting comet is headed to Middleton. The residents are all excited to go to the observatory to watch it as it only occurs once every 100 years. Nick and Grace get nostalgic as they deal with the last few days of high school. Adam and Stephanie are over the moon with glowing reviews of their food truck while Abigail is heartbroken over Donovan and decides to take a trip to Europe to get way from everything.
Hope Valley elects a new mayor. Lucas and Elizabeth try to find the "little moments" in their relationship. Elizabeth offers to help Nathan with his horse after the hit-and-run, but it's newcomer, Mei, who connects with Newton.
