"5"-- Spine.

Isadora Moon, a half-fairy, half-vampire, goes on a school trip to an old castle, where she and her friends meet a ghost.

Fans of Vampirina and the Princess in Black series will love Isadora Moon: half-fairy, half-vampire, totally unique--and totally unafraid to be different!Isadora is the only half-fairy, half-vampire in her human school. She knows what it's like to be different. But that's okay because everyone at her school is a little different from everyone else! When Isadora's classmates are frightened by a field trip to a spooky old castle (what if they see a ghost?!), it's up to Isadora to remind them that things that are different aren't necessarily scary.