Bells, bells, bells everywhere -- ringing at the right time, the wrong time, and all the time! And telephones, too -- to call up everyone in the family just when they do not wish to be disturbed! After Rob has filled his workshop and whole house with electrical pranks and nuisances, he is thunderstruck at the appearance of a strange being . . . the Demon of Electricity, called into existence because Rob has stumbled upon the Master Key! Equipped with new, seemingly magical abilities, Rob flies away -- literally -- on his way to perilous adventures, in this fairy tale of electricity, from the pen of the famous author of the Oz books.