About the book: the year / Day today clearly did not work out: the demon took Phoebe Halliwell into the past, several centuries ago. Phoebe doesn't know how to signal to her sisters that she's alive; doesn’t know how to return to her time... In addition, a demon is trying to kill her. Meanwhile, in the present, Prue and Piper are grieving the loss of their sister. But it's not just that. Something terrible happens to them too. They begin... to serve evil. Why? And how to prevent disaster without the Power of Three?