In the Maxwell laboratory, an exciting new experiment is underway – ‘Project Emerald Soup’ – but unexpected results occur. The Maxwell children discover that mysterious parties are interested.
A radiation panic forces the Maxwells out of their laboratory and the children try to locate the source of mysterious radio messages they have been receiving.
Jessica Maxwell
Jessica Spencer John Maxwell
William Dexter Penny Dalton
Annette Andre Tim Maxwell
Gregory Phillips Jo Maxwell
Janina Faye Gally Lloyd
Karl Lanchbury Poynter
Michael Bangerter Mrs Evans
Ethel Gabriel Gaunt
Allan McClelland Lee
Fredric Abbott Pascoe
Blake Butler
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Jessica Maxwell
