Lost in Time follows half-vampire Schuyler and her Blue Blooded bondmate Jack as they head to Egypt in search of the Gate of Promise. But what they find upon arrival in Alexandria isn't at all what they had hoped for. Everything Schuyler thought she knew about the Gate turns out to be a lie, and they soon find themselves ensnared in a deadly battle against the demon-born. Schuyler and Jack take up arms, only to realize that there is a much graver threat simmering in the Kingdom of the Dead.

Meanwhile, determined to save the only vampire she still loves, Mimi has followed Kingsley Martin into Hell. With the help of her new human Conduit, Oliver Hazard-Perry, Mimi makes a bargain with the Queen of the Dead that she may soon regret. When the time comes to choose between love and revenge, both Mimi and Oliver will learn the true meaning of sacrifice. Confronted by danger, betrayal, and loss at every turn, the Blue Bloods must find the will to fight-and love-another day."