by E. J. Stevens
Release date: December 13, 2010
Book 2 of the Spirit Guide series.
Description from the amazon:
Spirits of the Dead are coming...
Yuki is about to face an army of lost souls on Samhain, the night of Halloween, when the spirits of the dead roam free. Yuki will need all the help she can get from her friends, but will Calvin be there for her when she needs him the most?
fyi: kindle edition is currently available