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.