After nearly seventy years of peaceful coexistence among vampires, hybrids, and humans, a sudden surge in vampire attacks sends shockwaves through their society. A rogue vampire is ruthlessly targeting young women, leaving a trail of death in their wake, and sparing no one who dares to intervene. The Alliance, a formidable police force composed of hybrids, vampires, and human warriors, dedicated to maintaining order within the supernatural population, is now in relentless pursuit of this deadly vampire, unwavering in their determination to bring an end to the bloodshed.

Sofia Pierce had always been a feisty and ambitious human doctor, unafraid to tackle any medical challenge that came her way. She had a burning curiosity for the supernatural world that existed alongside the humans, a world filled with hybrids, vampires, and other mystical beings. Her life took an unexpected turn when she crossed paths with Gage Gallegos, a lethal vampire-hybrid known by the ominous nickname "Lucifer," a founding leader of The Alliance.

Their meeting was anything but ordinary. It was as if fate had conspired to bring them together. From the moment their eyes met, a powerful connection sparked between Sofia and Gage. Their worlds couldn't have been more different—Sofia, a brilliant human doctor, and Gage, a formidable vampire-hybrid who had walked the Earth for centuries. Yet, their attraction was undeniable.

Recognizing Sofia's talent and unyielding determination, The Alliance saw an opportunity to bridge the gap left when their human doctor retired, so they offered Sofia a position as their resident doctor. Sofia accepted the job offer with enthusiasm, driven by both her desire for a new and thrilling challenge and to expand her knowledge of the supernatural.

As the killer's reign of terror escalates, ordering the mass murder of nearly thirty women, panic spreads throughout the Seattle. The Alliance realizes the urgency of the situation when they uncover that the killer has been tracking Gage Gallegos, and it becomes evident that Sofia Pierce may now be in grave danger.

The realization that Sofia might be the target sends shockwaves through The Alliance. They immediately set up around-the-clock protection for her, with the deadliest and most skilled members of their force standing guard. Gage, fiercely protective of Sofia, takes personal responsibility for ensuring her safety.

Sofia's journey takes her from a world of medical curiosity into the heart of a supernatural battle for justice. The bonds she forms with these extraordinary individuals will not only shape her destiny but also play a crucial role in the ultimate showdown with the ruthless rogue vampire who threatens their world.

The Alliance is determined to stop the killer's reign of terror and protect Sofia at all costs, forging a bond that transcends the boundaries of species and human limitations. Despite the warriors' initial differences, Sofia's determination, intelligence, and fierce spirit win their respect and admiration. Now the unbreakable bonds that formed between them become a source of strength and unity.

The unsettling mystery lies not only in why the killer has been trailing Gage for the past one-hundred-fifty years but also the deeply disturbing enigma surrounding why he was being followed and why the rogue vampire may have an interest in Sofia now.

Sofia and Gage find themselves on a path of discovery, compelled to unearth aspects of each other's past that could either drive them apart or bind them together for eternity. A formidable battle lies ahead as their world starts to unravel at its seams.