Kingdom of Spirit and Shadow

The Adrian x Isolde series begins with Princess Isolde de Lara agreeing to marry Adrian Aleksandr Vasiliev, the feared vampire king known as the Blood King, to stop his armies from destroying her kingdom. On her wedding day, she secretly plans to assassinate him, believing his death is the only path to freedom, but the attempt fails and Adrian promises that if she ever tries again, he will turn her into the very creature she despises. Forced to join him in his realm and take her place in a brutal vampire court, Isolde struggles to reconcile her hatred with his unexpected kindness, their intense physical chemistry, and the unsettling sense that he chose her for reasons rooted in an older, hidden history that will upend everything she thinks she knows about their world and herself.