Fang & Metal (Vampire Detective Midnight 4)

Someone wants all the vampires dead. They may have found the perfect weapon.
Weirdest crime scene ever? Check. Guy eaten by a sentient wall? Check.
Every shady government agency in existence playing coverup? Check.
But is it murder?
Nick Tanaka, vampire homicide detective for the NYPD, stumbles into a political minefield when their new Midnight, a rookie vampire cop straight out of the police academy, shows up dead inside a high security vault. Morley, Nick’s boss, wants answers, but no one wants the NYPD on the case.
As a favor to Morley, Nick agrees to help, going to his contacts in the military-industrial complex to try and find answers.
Instead, he uncovers a conspiracy led by a murderous fanatic and his band of “blood-purity” crazies, who appear to want nothing less than all-out race war.
Worse, his hybrid girlfriend, Wynter James, is now in their crosshairs, too.
Book #4 of the Vampire Detective Midnight series.
VAMPIRE DETECTIVE MIDNIGHT is a romantic science fiction and fantasy series set in a futuristic, dystopian New York populated by vampires, humans and psychics trying to rebuild their world after a devastating race war nearly obliterates the previous one.
A spinoff of the Quentin Black Mystery series, it features vampire with a past and homicide detective, Naoko “Nick” Tanaka, who gets transferred to the NYPD after a bad incident in Los Angeles forces him to start a new life. Nick works as a “Midnight,” or vampire in the employ of the human police department, but when he arrives in New York, he really just wants to be left alone to work, surf, and deal with his immortality in peace.
Life, and the residents of New York, clearly have other ideas