Prudence, Piper and Phoebe Halliwell live together in the family Manor in San Francisco where they discover an old book — the Book of Shadows — in the attic. Bizarre occurrences begin and eventually leads the sisters to realize that they are not only witches, but the most powerful witches in the world, known in the supernatural circles as The Charmed Ones. Later, half-sister Paige joins the sisters after the tragic death of Prudence. The Halliwells use their powers to protect the innocent and vanquish evil. In a universe that encompasses horror, comedy, soap and adventure, Charmed is full of fun and is in fact, the longest running show with all-female leads, of all time.