Voodoo Moon

If her soul is bound by an evil spell,Call back her spirit with a ringing bell.Salt in her left hand, gold in her rightWill cast out the dark and restore her soul's light.The Halliwells are on vacation. It's time to party in New Orleans. But on Prue, Piper and Phoebe's first night in the Big Easy, Phoebe has a dream filled with images of strange, violent rituals under a full moon. Soon after, a new friend of Prue's disappears—on the night of the full moon! When the Charmed Ones try to find her, they are drawn into a dark world of voodoo sorcery… a powerful magic like nothing the sisters have ever seen. Voodoo Moon is the fifth of the Charmed novels. This novel is set between Season 1 Episode 22 Deja Vu All Over Again and Season 2 Episode 1 Witch Trial. Phoebe says it is June. The episode 'Witch Trial' clearly takes place during the Autumnal Equinox. But it mentions 21st century, putting it after 7/2 'They're Everywhere'.