Vampire Academy. Book 3. Kiss of Darkness

Strange and frightening things have been happening at the Vampire Academy lately. The magical protection is shutting down too often, and ruthless strigoi are attacking the Academy. And for some reason, the victims of their raids have exclusively been members of royal families.
Is this a fateful coincidence? Or someone's devilish plan aimed at seizing power in the secret community of blood children? Rose and Lissa will need all their strength and magical abilities to unravel the mystery without becoming victims of bloody intrigues.

The third book of the cult cycle by Richelle Mead in a convenient classic pocket format.