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?