The Return of Skeleton Man by Joseph Bruchac

This book is the sequel to Skeleton Man, which I did not read. Molly and her parents travel to the state of New York for her father's conference at the Mohonk Mountain House. Molly is still having bad dreams about Skeleton Man who kidnapped her parents. It's suspected that he killed several others families, but Molly was able to stop him. He dropped into a river, but his body was never found. Now, Molly suspects Skeleton Man is spying on her, and her father has the same family. She goes to a Day of the Dead dance with her parents and feels like something is seriously wrong. When an explosion turns the room into total darkness, she knows she's right.

It might have helped to read the first book, but I don't think it's necessary. The main characters are descendants of the Mohawk Indians, and their folklore is included in the story. A Rabbit helped Molly survive in the first book, and a Mexican spirit helps her in this one. As I tried to understand the plot, I seemed to be between reality and the supernatural. The characters had feelings and dreams about Skeleton Man, but many of the events could have occurred in real life. People who've read the first book might know more about him.