There are 2 books in the Freya series. The newest book is Slay which came out in 2018.

1
Freya

Book cover of Freya
Buffy the Vampire Slayer meets Neil Gaiman's American Gods. In her prime, Freya was the ancient Norse goddess of love, magic, and war, but her power is derived from belief, and true believers are hard to come by these days. Freya has been lying low in a mental hospital in…
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2
Slay

Book cover of Slay

"Move over, Percy Jackson, there’s a new girl in town." ―Booklist review for Freya

Her fight for freedom is over,
but the fight for power is just beginning.

After Freya escapes from the power-controlling Finemdi Corporation, her quest to defeat her new enemy takes her to Hollywood. The ancient Norse…