Dragon's Fall: Rise of the Scarlet Order Vampires - Scarlet Order Vampires, #1

Three vampires. Three lives. Three stories intertwined. Bearing the guilt of destroying the holiest of books after becoming a vampire, the Dragon, Lord Desmond searches the world for lost knowledge, but instead, discovers truth in love. Born a slave in Ancient Greece, Alexandra craves freedom above all else, until a vampire sets her free, and then, she must pay the highest price of all . her human soul.
An assassin who lives in the shadows, Roquelaure is cloaked even from himself, until he discovers the power of friendship and loyalty. Three vampires, traveling the world by moonlight-one woman and two men who forge a bond made in love and blood. Together they form a band of mercenaries called the Scarlet Order, and recruit others who are like them. Their mission is to protect kings and emperors against marauders, invaders, and rogue vampires as the world descends into the chaos of the Dark Ages.