Melena pretends to be unaware of the supernatural world around her, and never reveals she is fully aware her friend Lisette is a pixie. Mel is one of only a few Sensors left in the world; humans unaffected by magic whilst their blood can negate spells and weaken any supernatural creature that might feed from them. Mel is trying to remain incognito and keeps her interactions with supernatural to a minimum, yet she has nephilim Lucas trailing her (he's been threatening to kill her for years plus she can never forget he murdered her mentor)and when her human friend Aniya falls under the thrall of a vampire, she travels to Alaska to rescue her. Yet Alaska has a large supernatural population, and Mel finds it increasingly difficult to hide what she is.
Despite her gifts, Melena is seriously hampered by her human frailties and is frequently beaten up badly by either werewolves or vampires. She is a strong tough character, but she is often overshadowed by more powerful adversaries that seek to control her.
There isn't a solid romance introduced, but there are some sparks between Mel and several key male characters; nephilim Lucas, werewolf Derrick and vampire Nikolas. Yet none of these characters are particularly appealing throughout the majority of this book; prepared to hurt Melena for their own gains or sit idly by as she is tortured or when someone she cares for is murdered. Much is made of Mel's military background, so I did expect more from her in a fight; however she is always quickly overpowered when facing a supernatural enemy and is normally hurt badly enough to need vampire blood to survive her injuries.
I liked the supernatural world this author created, plus I enjoyed the ideas of Sensors. Although I've come across other books featuring a protagonist with the ability to negate magic, there are some interesting twists and turns to the plot. I plan to continue on with this series, but I do hope that Melena doesn't come across as such a victim in further books.