Yuki isn't a typical high school student. She smells dead people and is about to face an army of lost souls on Samhain, the night of Halloween, when the spirits of the dead are able to run free.
Calvin Miller is Yuki's boyfriend, he is the Alpha, the leader of a pack of werewolves. He and his subordinate, Simon, are attempting to find out who recently killed a werewolf and prevent more killing.
Yuki has an idea that might help identify the killer. She thinks the killer might also be a person of her age so she goes to the school library to see if anyone was recently reading books about methods to kill werewolves. She crosses path with someone rushing from the library. When the librarian informs her that this person was looking into werewolf matters, Yuki believes that she has found the killer.
There is a concern that Yuki has and that is if she will be able to handle Samhain. She does some research and finds that there is an amulet that can ward off the evil spirits that arrive on Halloween night. Will she be able to find the amulet? Will Yuki be able to get it on time, since Halloween is approaching?
Yuki's love for Calvin is well expressed. She shows that she is strong and yet vulnerable. At one point where she interacts with Calvin's spirit, it reminded me of Claire Abshire, heroine of "The Time Traveler's Wife.' Both Claire and Yuki are brought into a spirit world by meeting their respective lovers, Calvin and Henry. Both young women fight to keep their love alive and overlook the oddities in their lovers' existence. They are two charming characters in two unique and memorable novels.