Marked is about a girl named Zoey Redbird. Zoey is chosen by a "tracker" to become a fledgeling of the school for vampyres, the House of Night. As she makes a transition from normal life to the life of a vampyre, she must undergo something that every other fledgeling must: the Change. Upon completion of the Change, the fledgelings will begin to turn into an adult vampyre. Some, however, may not survive this change. While Zoey undergoes this change, she must try to adapt to her new life, being away from her family and trying to make new friends. However, Zoey is different from the other fledgelings; she has been granted special powers by Nyx, the vampyre Goddess. With these powers, Zoey must stop the leader of a group called the Dark Daughters, who has been abusing her gifted powers. Will Zoey be able to take down this elitist group of Daughters with help from her new friends?