Set in Stone (Disney: A Twisted Tale #15)

What if Arthur wasn't supposed to be king? Having pulled the sword from the stone, scrawny Arthur has gone from washing dishes to sitting on the throne at Camelot Castle. What he doesn't know is that the scheming witch, Madam Mim, used her magic to help Arthur free the sword, believing the boy would be easy to control once he was made king. When Arthur proves more capable than she imagined, Mim sends her foster daughter, Guinevere, to put Arthur back in his right place washing dishes. But Arthur and Guinevere discover Mim's manipulations and forge an unlikely friendship. As they search for a way to outwit Mim and unite the kingdom, they realise that no one's fate is set in stone.