When the Halliwell sisters (Prue, Phoebe, and Piper) are reunited in their grandmother's home, they are drawn into the attic where they find The Book Of Shadows. The Book Of Shadows is a book of witchcraft. It defines the role of the Charmed Ones, three of the most powerful witches who will come together to receive their powers on the night of a full moon.
With the full moon over their heads, the Halliwell sisters descend the stairs from the attic and into the world of the supernatural. If they are witches, then they need to learn about their newly acquired powers, and they need to learn fast. According to legend, warlocks and demons feast on the powers and lives of good witches. They need to face the truth to survive.