There are 5 books in the Lockwood & Co. series. The newest book is The Empty Grave which came out in 2017.

SOON TO BE A NETFLIX SERIES

A sinister Problem has occurred in London: all nature of ghosts, haunts, spirits, and specters are appearing throughout the city, and they aren't exactly friendly. Only young people have the psychic abilities required to see-and eradicate-these supernatural foes. Many different Psychic Detection Agencies have…
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2
The Whispering Skull

Book cover of The Whispering Skull

Now a major Netflix series!

Ghosts and ghouls beware! London's smallest, shabbiest and most talented psychic detection agency is back.

Life is never exactly peaceful for Lockwood & Co. Lucy and George are trying to solve the mystery of the talking skull trapped in their ghost jar, while Lockwood is…

3
The Hollow Boy

Book cover of The Hollow Boy
Lockwood & Co. might be the smallest (some might say shambolic) Psychic Detection Agency in London. But its three agents - Lockwood, Lucy and George - are exceptional Talents. And they get results. When an outbreak of ghostly phenomena grows to terrifying levels in Chelsea, Scotland Yard is left baffled.…

4
The Creeping Shadow

Book cover of The Creeping Shadow

Now a major Netflix series!

Lucy has left Lockwood & Co. A freelance operative, she is hiring herself out to other agencies - agencies that might value her ever-improving skills.

But now Lockwood needs her help.

Penelope Fittes, leader of the well-renowned Fittes Agency wants Lockwood & Co. - and…