Summer is usually a time of fun and games for most children, but Hanna
and Ben Littleton are not your average eleven and twelve-year-old. Their
father is Percy Littleton, a famous paranormal investigator, and this
summer they are traveling to different locations to investigate
unexplained phenomena. Things are rather boring until they stop at
Castleridge Hotel. Though warned by their father not to meddle in his
investigation, the brother and sister are convinced they can prove their
worth as true investigators. Their eagerness soon turns to terror when
Hanna begins having visions about a certain former employee of the
hotel, the elevator takes them to the ninth floor on its own, and ghosts
interact with them. The building seems to have a mind of its own as
Hanna and Ben are forced to figure out what really happened one hundred
years ago at Castleridge Hotel, before the spirits trapped inside decide
to make them permanent residents.