Her evidence says his company made the poison. His blood says the truth is far more dangerous.
Forensic toxicologist Naomi Kersey trusts evidence, not miracles. Then her sister collapses after an invitation-only renewal infusion, and the unknown compound in Naomi's lab points to Daybridge Biologics-and its maddeningly controlled founder, Vincent Arlen.
Vincent has spent more than a century hiding what he is. His stolen treatment was designed to free vampires from hunger and sunlight. The counterfeit circulating through private clinics does the opposite: it leaves human patients dependent and vampires dangerously ravenous.
With a mass release eight nights away, Naomi and Vincent must trace the altered formula through a company built on secrets. Every answer binds them closer. Every boundary they negotiate makes their attraction harder to deny. But Vincent is still withholding the consequence that could destroy his empire and the future Naomi is beginning to want: the genuine cure will give him daylight-and make him mortal.
When protection turns into control and certainty becomes its own kind of danger, saving the city will require more than exposing a criminal network. Naomi and Vincent must decide whether love can survive the truth-and whether a finite life together is worth surrendering everything that kept them safe.
The Daylight Formula is a sleek, high-heat adult vampire romance layered with biotech suspense, forced proximity, a morally complicated immortal hero, and a heroine who refuses to mistake control for devotion.