The Vampire's Hourglass — Shayne Leighton

After narrowly surviving a near-death experience in an effort to save Valek from yet another showdown with Aiden, Charlotte awakens inside the forsaken, crumbling walls of the Regime Palace. Though she finds herself surrounded by her closest friends, she is conflicted by her feelings of the sudden absence of her Vampire guardian. With Nikolai to console her, Charlotte cannot shake the undeniable chemistry she feels for this familiar stranger. But they are running out of time. Charlotte's peculiar ailment will return, and she will die. Charlotte, Nikolai, Sarah, and several others travel to the underbelly of Prague to search for Valek. But what they discover are the dark secrets the elder Vampires have been hiding for centuries. Charlotte must overcome her mortal limitations to win back the heart of the one she truly loves and escape the gates of Abelim with her throat intact in this enthralling, highly anticipated third installment of the Of Light and Darkness Series.