After an abrupt end to her ghost-hunting training, Lucy Carlyle flees to London, where she meets two teens who run a paranormal investigative agency.

After a job goes up in flames, Lockwood is given two weeks to come up with £60,000 in damages; Lucy uses the ring to communicate with the spirit.

Hoping to pay back their debt, the team takes on a job for an unexpectedly high-profile client; however, the task proves more treacherous than they imagined.

While the team is working to clear up a volatile grave at a cemetery, Lucy hears a voice speak her name.

The team scrambles to locate a missing relic before their rival agents do; deep in the ghost-hunting underworld, danger lurks around every corner.

The jarred skull leads Lucy to Bickerstaff's home; the team accepts an invitation to the Fittes ball, hoping to snag a rare book from the company library.