When Amber Darien was in her late twenties, a secret government agency coerced her into the role of lead physic investigator to a task force in Massachusetts. The team's primary function to which she was assigned? The monitoring and policing of energy-deficient individuals that medical science could genetically identify and were so labeled as 'vampires' because of their needs.
A few years after the task force was created, Amber finds herself in the middle of an unusual serial killer case. She must use her abilities and intellect to find a killer who can psychically shield themselves from being heard or seen while killing and afterward.
While the investigation takes place, Amber needs to deal with the vampire community. She must gain their help, traverse the misconceptions between them and ordinary people, and survive the effects of a highly advanced collar forced upon her by the unknown government agency.