A year after the events of Let's Split Up, the gang returns to their hometown of Sanera for a Halloween festival, only to be drawn into a chilling new mystery when a figure from their past reemerges, turning a nostalgic reunion into a deadly game of cat and mouse.

A year after solving their last mystery, the Sanera gang has split up to pursue college life, leaving their detective days behind—except for Cam, who struggles to move on. Now an assistant coach for the Sanera Sabretooths, Cam feels adrift until the Halloween festival brings the gang back together for a commemorative event. But when Cam sees the Carrington Ghoul—a figure tied to their final case—he's thrust into a new mystery.

As Sanera's Halloween festival descends into chaos, the gang discovers that someone is using local legends to commit gruesome murders. The killer's obsession with their past exploits becomes clear as each murder echoes the myths they once debunked. With the town's history exploited for tourism and the gang's fame drawing unwanted attention, they must unravel the clues before the killer strikes again—this time targeting one of their own.

Facing familiar fears and new terrors, the gang must rely on their wits and each other to survive a twisted plot that threatens to make their past case the stuff of legend—for all the wrong reasons.