In search of Kayla and on the run, Kiera and her friends make a race against time across the Cumbria Mountains. With vampires predicting their every move, the trust among Kiera and her friends starts to waver.
From the desolate monastery set high in the mountains, to the mysterious lake and the caves beneath the fountain, Kiera must discover the connection between the vampires and her mother, Isidor, and Kayla - all while trying to resolve her feelings for Potter and Luke.
In the midst of dealing with all of this, Kiera herself begins to change, and this frightens her. She turns to her friends for help, but soon realizes it is only her mother who can provide the truth and answers she needs. Kiera also has other questions she needs answered: Why did Isidor murder an innocent girl? Who is the person Murphy has been meeting with in secret? And above all, why have they put their lives and trust in the hands of a serial killer?