There are 3 books in the Spectral City series. The newest book is A Summoning of Souls which came out in 2020.

Solving crime isn’t only for the living.
 
In turn-of-the century New York City, the police have an off-the-books spiritual go-to when it comes to solving puzzling corporal crimes . . .
 
Her name is Eve Whitby, gifted medium and spearhead of The Ghost Precinct. When most women are traveling in…
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2
A Sanctuary of Spirits

Book cover of A Sanctuary of Spirits
New York, 1899, and the police department’s best ally is the secret Ghost Precinct, where spirits and psychics help solve the city’s most perplexing crimes . . .

There’s more than one way to catch a killer—though the methods employed by the NYPD’s Ghost Precinct, an all-female team of psychics…

3
A Summoning of Souls

Book cover of A Summoning of Souls
At the dawn of the twentieth century, New York City houses both the living and the dead. And when it comes to crimes of an otherworldly nature, it falls to the psychics and spirits of the city’s finest secret agency—The Ghost Precinct—to serve justice beyond the earthly realm . .…