When a body is found at the Hudson carnival grounds at Horseshoe Bay's Harvest Carnival, Nancy and the Drew Crew find themselves facing a new mystery.
Chemistry reaches new highs between Nancy and her law enforcement counterpart. Meanwhile, Carson and Ryan are at odds on how to parent Nancy while Nick and George face new challenges in their relationship.
Nancy and the crew follow a new lead on the Frozen Hearts Killer from a podcaster at an amateur detective convention, which leads them to unveil clues about a murder from the 1950s.
When a supernatural being causes everyone in town to sleepwalk, threatening their lives, the Crew rushes to protect them. Meanwhile, Nancy's feelings towards Ace begin showing.
Nancy enlists the help of Temperance after facing obstacles in the Frozen Hearts case. Meanwhile, George finally faces a person from her past.
The crew is in search of an underground prison that could help their case, while they also follow a clue that could help George with her supernatural illness.
Nancy and the crew try to find a relic to separate George's soul from that of Odette Lamar. Meanwhile, Ryan and Carson are affected by a substance that reverts them back to teenage recklessness.
Nancy, Temperance, Bess, and Agent Park team up to take on a supernatural entity that feeds on people's sadness, which was accidentally unleashed in an attempt to catch a murderer.
Ace is faced with obstacles that prevent him from working with Nancy and Agent Park on the FHK origin investigation. Meanwhile, Nick, George, and Bess uncover the truth behind the death of a college student.
A cocktail party for all the townspeople is hit by a truth-inducing spell, which results in a tirade of confessions.
Nick, on jury duty, suspects that a fellow juror could be the next victim of the Frozen Hearts Killer. Meanwhile, tensions rise within the Drew Crew in light of the recent romantic developments.
Coming very close to solving the Frozen Hearts case, a setback causes the Drew Crew lots of distress. Meanwhile, Nancy is on the look for a missing person whom Temperance is going after.
The Drew Crew have to find a way to defeat their strongest enemy to date, as the fate of the town depends on their success.