Old Witch likes nothing better than to fly about on her broomstick crying "Heh-heh!" and casting abracadabras, but now she has been sent away... by two young girls.

Amy and Clarissa love to tell stories about Old Witch... until one day they decide she is just too mean and wicked. Drawing a rickety old house upon a barren glass hill, the girls exile Old Witch there with the warning that she'd better be good - or else no Halloween! For company they draw her Little Witch girl and a Weeny Witch Baby.

Old Witch tries to be good, but anyone would get up to no good in a place as lonely as the glass hill... as Amy and Clarissa find out when Old Witch magics them into her world, a world of make-believe made real.