قصة السِّرُّ الكبير

Crazy Grandpa and Time Machine- The Big Secret

Grandfather Aref is busy working on his new secret invention, and everyone is eager to know what the genius grandfather is hiding and what kind of a machine he is making. All that and more when you read (السر الكبير) from the series .جدي العبقري وآلة الزمن

"Crazy Grandpa and Time Machine" series includes ten science fiction novels that will take you to a world of adventures in different eras, from the first man who tried to fly to the invention of electricity and communications, through space and towards the future!