Grace and her four best friends, Jenny, Rachel, Adie and Una, are failed witches – and they have a notebook full of useless spells to prove it. But one night, they stumble upon real magical powers – and their notebook takes on a diabolical life of its own. The girls watch, helpless, as, one by one, their spells start to work, moving relentlessly towards the worst one of all ... Can Grace and her friends stem the wave of powerful magic ... before tragedy strikes?