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.

With George and Flo on standby, Lucy and Lockwood infiltrate a black market auction where members of the underworld will bid on a priceless artifact.

Hoping to pay back their debt, the team takes on a job for an unexpectedly high-profile client. But 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. Ghosts aren't supposed to talk... are they?

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

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.

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

As Lockwood and Lucy uncover the nature of the bone glass, they come to understand that George's life is in danger — and time's running out to save him.