On the evening of Horseshoe Bay’s annual Harvest Carnival, the body of a mysterious young man is discovered on the Hudson carnival grounds. The Drew Crew is drawn into the case by a host of confounding clues surrounding a new menace terrorizing the town – a killer who has an enigmatic connection to none other than Nancy’s newest foil: Temperance Hudson.

As the gang investigates the Frozen Heart murders, sparks fly between Nancy and her counterpart in law enforcement on Nancy's first day as the community liaison. Temperance makes a startling offer at the police station.

On the trail of the Frozen Hearts Killer, Nancy and her friends follow a surprising lead from a podcaster at an annual convention for amateur sleuths, where they also find themselves unraveling ghostly clues about a homicide from the 1950s.

Sleepwalking suddenly spikes in town and Nancy questions whether Frozen Heart murders has been solved.

After a major setback in the Frozen Hearts case, Nancy asks Temperance for help with an occult approach to getting answers from a murder suspect. Meanwhile, the Bobbsey entanglement creates a world of trouble for Ace, and George has a long-overdue confrontation with someone from her past.

The Drew Crew goes on the hunt for an underground prison that may hold answers to the Frozen Hearts killings – all while following a lead on a relic that could cure George of the paranormal affliction that’s shortening her lifespan. Ace tries to enlist Amanda Bobbsey in bringing her father to justice.

While Nancy and her friends race to find the relic that could finally untangle George’s soul from Odette Lamar’s, Carson and Ryan are affected by a mystical substance that prompts a temporary return to the lowered inhibitions of adolescence.

Nancy, Bess, Agent Park and Temperance have to join forces when an attempt to trap a killer ends up unintentionally unleashing a deadly supernatural entity that feeds on people’s sorrows. Meanwhile, Ace and Ryan discover a haunting at the Historical Society, and George meets a friend from Nick’s past who may have secrets of her own.

Nick, George and Bess unravel the truth behind a college student's mysterious death, while unexpected obstacles prevent Ace from working with Nancy and Agent Park as they grow closer and investigate the hidden origin of the Frozen Hearts Killer.

A truth-inducing ritual takes hold of a town-wide cocktail party, yielding volcanic emotional confessions and a surprising romantic connection for Nancy.

While serving on a jury, Nick realizes that one of his fellow jurors may be the next target of the Frozen Hearts Killer.

The fate of Horseshoe Bay rests in the hands of the Drew Crew, who must find a way to defeat their most powerful nemesis yet. Lives and hearts are in supernatural jeopardy - and a star-crossed choice will change everything, forever.