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The Name of the Star (Shades of London, Book 1)
Maureen Johnson
Teen Rory Deveaux trades the sultry slow life of Louisiana for the academic rigors of a year at Wexford boarding school in London. Unfortunately she lands in London in the middle of a spree of copycat killings that echoes the 1888 grisly murders by Jack the Ripper.

As the police hunt for a prime suspect in the brutal murders, Rory settles into the school and meets new friends. Some of them are very unusual...they can see ghosts just like Rory can!
Unfortunately, she comes across the ghostly killer—and he intends to continue killing until Rory surrenders to him!

It's time to go on the hunt. Employing a terminus, a device that eliminates lingering ghosts, Rory and her sighted snarky friends take to the London underground to hunt down the deadly spirits and “terminate” the Ripper.