In a world where vampirism is a known and highly regulated medical condition, Caleb is a new and unwilling inductee. Haunted by loneliness and the ethical horror of his new existence, he takes a job that is a quiet form of self-torture: a night-shift technician at a 24-hour blood donation clinic. His plan is simple: surround himself with a safe, humane source of sustenance to study, and keep his head down, forever. He expects only the low hum of refrigerators and the constant, silent battle for control. He doesn't expect Dr. Ben Carter. Ben is a brilliant, funny, and relentlessly human hematologist who works late, fueled by coffee and an infectious passion for his research. He's immediately intrigued by the quiet, melancholic new tech who knows more about blood than any Level 1 technician should. Under the sterile fluorescent lights, an easy friendship sparks into an attraction that is as powerful as it is forbidden. For Caleb, whose primary rule is to protect humans from his world, falling for one-especially a man who works with blood-is his greatest taboo. Their connection is governed by an unspoken "sunset clause": it can only exist in the stolen hours between dusk and dawn. But as their orbits draw closer, they soon find that the most dangerous secrets are not the ones kept in files, but the ones shared between two hearts in the quiet of the midnight shift.

The unspoken arrangement between Caleb and Ben deepens into a dangerous, magnetic obsession. Confined by the sterile walls of the lab and the hours of the night, their professional curiosity gives way to a raw, physical longing. Every accidental touch in a cramped supply closet and every shared glance across a microscope is charged with an electric, forbidden desire. Ben, driven by a need to understand the man he's falling for, blurs the line between scientist and suitor, his obsession with Caleb's mysterious condition becoming intensely personal. But when a simple accident exposes Ben to the true, primal nature of Caleb's hunger, their fragile world of stolen moments is shattered. Forced to confront a reality far more terrifying than any medical diagnosis, Ben must decide if the man he desires is worth the monstrous risk. Under the fluorescent lights, their forbidden romance is no longer a slow burn-it's about to ignite.

Following a catastrophic accident that leaves Dr. Ben Carter at the brink of death, a choice is made that shatters the boundary between life and death, forever binding him to the enigmatic Caleb. Their bond, now sealed in blood and sacrifice, plunges them into a shared twilight where every moment is fraught with new danger and profound intimacy. The consequences of that choice leave Ben irrevocably changed, tethered to the shadows in ways he could never imagine and grappling with a new, dangerous reality he doesn't understand. Caleb, now bound by his decision, must guide Ben through a treacherous world where every night is a test of survival and every secret threatens to consume the man he fought to save. No longer just lovers, they become partners in a desperate alliance against the darkness, both outside and within. But the human world Ben left behind has not forgotten him. His sister's relentless search for answers threatens to expose their fragile sanctuary, and every lie they tell to protect their secret chips away at the man Ben once was. When their existence attracts the attention of another, older immortal whose code is far more brutal than their own, their quiet, eternal life becomes a desperate fight for survival. In this final, stunning conclusion to The Sunset Clause trilogy, Caleb and Ben must discover if a love that defied death can survive eternity. Is their bond strong enough to build a home in the darkness, or will the first light of their new life be the very thing that casts the longest, most devastating shadows?