Whispers of Doubt (W.I.T.C.H. Chapter Books #20)

Nerissa appears to have been destroyed, and Irma, Taranee, Cornelia, and Hay Lin think they have nothing to worry about. But Will is not so sure. the Battle with Nerissa seemed too easu, and that has made Will Nervous. She finds herself slowly pulling away from the group and goes to seek advice from an unlikely source. The results are disastrous as her whispers of doubt allow an old evil to return.