Two girls have the daunting and sometimes terror filled task of trying to save their father's inventions including Robert the Robot. The Army, the Navy, a foreign country, U.S. Government agents and a thief are determined to have the robot and other inventions. They will do all they can to get them. What can two young girls do, even when aided by two friendly boys, to save their father's inventions and his reputation while in severe jeopardy?