Lost in Time (Blue Bloods Series #6)

The stakes have never been higher for the young Blue Bloods of Manhattan. After their brief yet beautiful bonding ceremony in Italy, Schuyler Van Alen and Jack Force depart for Egypt, desperate to find the elusive Gate of Promise before Jack must face his twin, Mimi, for a blood trial. A blood trial that only one of them can survive. But 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.