There are 8 books in the SPI Files series. The newest book is The Gorgon Agenda which came out in 2023.

1
The Grendel Affair

Book cover of The Grendel Affair
We’re Supernatural Protection & Investigations, known as SPI. Things that go bump in the night, the monsters you thought didn’t exist? We battle them and keep you safe. But some supernatural baddies are just too big to contain, even for us…
 
When I moved to New York to become a…
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2
The Dragon Conspiracy

Book cover of The Dragon Conspiracy
After solving The Grendel Affair, the agents have another SPI File to investigate...

We’re Supernatural Protection & Investigations, known as SPI. We battle the real monsters of myth and legend, but this Halloween, we’re searching for diamonds…

A gala opening at the Metropolitan Museum of Art has attracted the upper…
Men in Black meets Janet Evanovich’s Stephanie Plum in the new urban fantasy novel starring seer Makenna Fraser and her fellow agents at Supernatural Protection & Investigation.

The agents of Supernatural Protection & Investigations (SPI) know that fighting evil is a full-time job, especially when a new designer drug—with mind-blowing…

4
The Ghoul Vendetta

Book cover of The Ghoul Vendetta
Men in Black meets Janet Evanovich’s Stephanie Plum in the fourth urban fantasy novel in the series starring seer Makenna Fraser and her fellow agents at Supernatural Protection & Investigation.

The agents of Supernatural Protection & Investigations (SPI) are paid to keep the peace. But that’s not so easy when…

5
The Myth Manifestation

Book cover of The Myth Manifestation
The agents of Supernatural Protection & Investigations (SPI) protect people from predatory supernaturals. This time, we’re the ones who need protection. New York is one of the most popular convention destinations in the world—for humans and supernaturals. Every hundred years, rulers of the world’s supernatural races come together to negotiate…

6
The Phoenix Illusion

Book cover of The Phoenix Illusion
The agents of the Supernatural Protection & Investigation (SPI) are used to dealing with the weird and the wacky, but even they are stunned when a building from another world suddenly appears on an empty lot in New York. . . I’m Makenna Fraser, seer for SPI, and it’s just…

7
The Solstice Countdown

Book cover of The Solstice Countdown
As an agent of Supernatural Protection & Investigations (SPI), I know that evil doesn’t take a vacation, but this time it made an exception and followed me on mine.I’m Makenna Fraser, seer for SPI, and I’m taking my boyfriend, goblin dark mage Rake Danescu, home for the holidays to meet…

8
The Gorgon Agenda

Book cover of The Gorgon Agenda
A planet-killing weapon, sinister sisters, and immortal monsters.
All in a day’s work for the agents of SPI.

I’m Makenna Fraser, seer for SPI (Supernatural Protection & Investigations). I knew SPI protected some of the world’s most dangerous relics, but I didn’t know our draconic founder, Vivienne Sagadraco, kept them…