"Bunnicula" is a children's book written by James and Deborah Howe that tells the story of a pet rabbit named Bunnicula. The story is narrated by a dog named Harold and his feline friend, Chester. They suspect that Bunnicula is a vampire because he has unusual habits, such as sucking the juice from vegetables. The book combines humor and mystery as Harold and Chester try to uncover the truth about Bunnicula's strange behavior. It explores themes of friendship and loyalty while entertaining young readers with its playful narrative and engaging illustrations.