Tyler Campbell is an artist and a nascent author who is writing a book on the early history of Denver. While sketching the tunnels below the city to illustrate his book, he meets Marin, who is there for reasons of his own. Tyler is instantly drawn to the handsome, amber-eyed man. A man he has no reason to believe is anything other than another human, although humans are aware that supernaturals live among them.
Marin is appalled when his panther reveals that Tyler is his fated mate. Things get worse, in his opinion, when he needs Tyler's help to stop a vicious gang of humans bent on destroying all supernaturals.
Will they be able to stop the gang, and if so, will Marin's vampire half allow his growing interest in Tyler to become more? If he does, he will have to reveal what he is, which could destroy any hope that they might have a future together.