The Hidden Rune of Iron (Spellcrackers.com)

The fifth and final installment in a kickass urban fantasy series about fae Genny Taylor who works for Spelltrackers.com, run by witches—it pays the rent, lets her do what she's good at (magic and crack it), and it keeps the vamps off her back The final book in the Spellcrackers series is rollicking, action-filled adventure. Packed with humor, magic, romance, and a few revelations, and the cameo appearence of a few characters from Ben Aaronovitch's Peter Grant novels (Midnight Riot, Moon over Soho, and Whispers Under Ground), this is a powerful end to a fresh, fantastic, satisfying story.