Wealthy, reclusive brothers Alexander, Nicholas, and Lucian Roman long ago rebelled against the restrictive Eternal Order of vampires. When a superpowerful part-vampire Impure starts attacking purebloods, the order forces Alexander to undergo a dangerous physical transformation. As a side effect, he develops a fierce craving for his as yet unidentified true mate. To Alexander's dismay, he forms a bond with human psychiatrist Sara Donohue, who saves him during a vulnerable moment.