Carnivàle is set in the United States during theGreat Depression and Dust Bowl. In tracing the lives of two disparate groups of people, its overarching story depicts the battle between good and evil and the struggle between free will and destin, the storyline mixes Christian theology with Gnosticism and Masonic lore, particularly that of the Knights Templar.
The discovery that they are descendants of a long line of witches finds three sisters battling demons and warlocks - and occasionally each other.
When the beautiful Halliwell sisters inherit a house from their grandmother and discover a secret "Book Of Shadows," they learn that they each have a unique power. The strong-willed Prue can move objects, reserved Piper is able to freeze time, and the uninhibited Phoebe sees the future. Individually, each is strong, but it is only by putting aside their differences and banding together as the "Power of Three" that they will be able to protect the innocent and vanquish evil.