The Shadows of Durmstrang

Hermione Granger never imagined her father was Lord Voldemort or that she would be branded with the Dark Mark and forced into his ranks as a Death Eater. Now Voldemort demands proof of her loyalty. To protect her place as Dumbledore's double-agent, Hermione must do the unthinkable: hunt down Igor Karkaroff, the deserter marked for execution.
Her search takes her to Durmstrang... and to Viktor Krum, the boy she once cared for and must now deceive. Torn between duty, morality, and the ruthless demands of espionage, Hermione must decide what she's willing to sacrifice to keep her place among monsters without becoming one.