House of Hollow is a gothic book, through and through. It's not a mystery, though mysterious events occur. It's a dark gothic novel with bits of horror mixed in. Think of Scary Stories to Tell in the Dark, the movie or the book, if it were written and directed by Hans Christian Andersen. Iris Hollow is 17. When she was young, she and her two sisters went missing around Christmas time. They were there one minute, then their mother looked away then back again and they were gone. No trace. When the sisters finally reappear near their house one day years later, no one can explain how they went missing or how they returned, not even the girls themselves. Such is the lore of the Hollow house. Now, Iris's older sister Grey is missing again, and strange yet familiar things start happening. Iris knows Grey is hiding something, but first Iris has to find her.