House of Crimson Hearts: A Steamy Vampire Fantasy Romance (Kingdom of Immortal Lovers) by Ruby Roe

Once upon a time, a vampire corrupted a hunter. Octavia Beaumont, one of the original three vampires, is determined to run the city. Red, an expert hunter, is hell-bent on getting revenge on the vampire that turned her sister. When deadly trials for the heir of the city begin, Red and Octavia are forced to work together. Octavia wants a crown. Red wants blood. But there’s only one first place. To win, they’re going to have to trust each other. But teamwork is not easy when their past is filled with betrayal… A betrayal Red can’t remember. Someone is lying. Read more