13 is the finale novel in Women of the Otherworld series by Kelley Armstrong.

[1] 13 centers around Savannah Levine, who is experiencing a new and dark magic inside of her that gives her abilities that seem foreign and thrilling.

On the eve of the battle between the Otherworld and Supernatural Liberation Movement, the major supernaturals must come together to fight for their lives and for the existence of the Otherworld.

Dear Author gave the book a "B" rating, writing that "Overall, despite some issues, I found Thirteen to be a satisfying conclusion to the Otherworld universe.

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