There are 3 books in the City of Ghosts series. The newest book is Bridge of Souls which came out in 2021.

1
City of Ghosts

Book cover of City of Ghosts
Ever since Cass almost drowned (okay, she did drown, but she doesn't
like to think about it), she can pull back the Veil that separates
the living from the dead . . . and enter the world of spirits.
Her best friend is even a ghost.

So things are already…
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2
Tunnel of Bones

Book cover of Tunnel of Bones
The thrilling sequel to Victoria Schwab's New York Times
bestselling City of Ghosts!
Trouble is haunting Cassidy Blake . . . even more than usual.

She (plus her ghost best friend, Jacob, of course) are in Paris,
where Cass's parents are filming their TV show about the world's
most haunted…

3
Bridge of Souls

Book cover of Bridge of Souls
#1 New York Times bestselling author Victoria
Schwab invites readers to New Orleans in this instalment of her
thrillingly spooky City of Ghosts series!

Where there are ghosts, Cassidy Blake follows ... unless it's
the other way around?

Cass might have this ghost hunting thing down.
After all, she and…