Voices in stone

the long version

"Isis, the daughter of a charlatan psychic, can see ghosts - including that of her dead little sister, Angel. Gray is the son of a UFO-chasing conspiracy theorist. The two teenagers are forced together when their parents start dating. After a reluctant start, a friendship develops and Isis confesses her secret ability to Gray. But when Isis' mum is inducted into an elite psychic society, run by charismatic Philip Syndal, Isis discovers there are sinister intentions beneath Philip's charm. She and Gray find themselves in grave danger and Isis is forced to use her considerable powers to save them both." --Publisher description.