The Power of Three (novel)

Power of Three was the first Charmed novel.

It is a novelization of the episode "Something Wicca This Way Comes" but has some additional scenes.

One additional scene occurs during the night right after Phoebe had released The Charmed Ones power. She stayed up all night reading the Book of Shadows and has an encounter with a ghostly Melinda Warren. (if one recalls the tv episode Phoebe says she was up all night and couldn't sleep!)

Another additional scene involves Phoebe traveling on bicycle to an Occult book shop (not that hard to find in San Francisco!) to learn more about Wicca powers. There she encounters Andy who is researching similar things for the murders (of which Jeremy was responsible). Andy, being an Inspector, has the murder-weapon dagger with him, Phoebe sees it and is scarred and thinks Andy might be the serial killer!