Sanctuary by Bree M. Lewandowski

In the Cloistered City, elite soldiers known as Shivalry walk taller than normal men.

Petra Ondise swears on her brother’s memory to rise from her role as a clothes-washing maid and join the House of Couriers. Once there, she will learn why her brother, who was a loyal courier to the crown, was killed.
As the Festival of the Late Harvest Moon approaches, Petra crosses paths with Third Shivalry Captain Rand Tsenturian, whose dark red eyes haunt her thoughts. He seems to linger in her shadow. Amid the countless rumors that run wild in the royal city, Petra learns her brother and the captain were not strangers.
Yet, in the wake of the Festival of the Late Harvest Moon, Rand steps out of the shadows and pulls her to an ancient garden, hidden in the emperor’s palace. Eternity lingers there. An ancient incantation tempts and destiny takes over. Now she is Sacred. He is her Sacrifice, and the walls of the Cloistered City will not be able to hold them.
An unforgettable fantasy romance about where truth leads and how far love will go.