It is six months since Greg, Agnes and Jack left Whitecross. Seth finds Jack wandering in a fever in some woods and takes him back to his home to look after him. There finds that Jack has letters for Charles and Jenny which are from Greg. Charles, Pet, Jenny, Hubert and the children have moved from Whitecross to Challoner. When they learn the news about the letters, Jenny and Charles go to Seth's home. Jack is delirious and says some unintelligible things about a place called Wellingham, where he and Greg had been. A distraught Jenny is desperate to see Greg again, so she and Charles head off to Wellingham. Pet also sends Hubert on after them. After rescuing a man staked out in the woods and meeting the authoritarian Clifford and the sinister Miedel, Jenny and Charles become worried about the situation in which they have become embroiled...

Jenny is searching for Greg alone. Not far away Greg is travelling with Agnes when they come across an old woman in distress. She introduces herself as Mrs Butterworth and explains that she is being plagued by what she terms 'red indians'. Greg investigates and discovers a community of children are behind the raids on her house. They are led by a tough boy called Eagle who does not want Greg to interfere, despite the fact that many of their number are dying of a mysterious illness...

Charles, Hubert and Jenny are reunited with Agnes, who has become separated from Greg. They visit the Walter's family farm, where Greg and Agnes met Tom Walter and his family some months ago. However, the farm is deserted as Tom' mother, Edith, and her sons Steve and Owen were driven from it, when Tom was away, by former butcher Brod, to a camp by a railway line. Charles, Jenny, Agnes and Hubert are captured and taken there as well. Brod has special plans for Jenny and sees Charles as a threat to his position...

Charles searches alone for Tom Walter and has a dangerous encounter with a dog pack. He is rescued by a man called Fenton, who Charles then travels with back to his halfway house. The next morning Charles discovers that Fenton has contracted rabies. Securing Fenton he goes to a nearby village for help. Charles returns with two men, Sanders and Jim. They are attacked by Fenton and Charles is forced to kill him. However, the men believe that Charles may have the infection too so try to execute him. Charles flees into the countryside and a hunt begins...

Charles returns to the Walter's farm where he is reunited with a relieved Jenny and Agnes. Hubert discovers that the cows have brucellosis and tends to them whilst Jenny and Charles head up river to locate a vet called Bill Sheridan. They meet Bill and his partner Alice and the following day Charles and Bill head back to the farm. Before they return to Jenny and Alice they see a car travelling along a road. Charles jumps to the conclusion that Greg could have been the driver. Jenny is excited when she hears the news and sets off with Bill to locate him. Before they leave they all agree to rendezvous at Highley train station for what Charles hopes will be market day...

Jenny, Charles and Hubert meet vet Janet Millon when a shepherd friend of Hubert is injured. Whilst enjoying her hospitality they discover to their amazement that she is the mother of their John, who is back at Challoner with Pet and Jack. Jenny has grown tired of her search for Greg and elects to return with Janet, as she wants to see her son too. When Pet tells John the news his reaction is puzzling...

Charles, Frank, Jenny and Hubert are now searching for former electrical engineer Alec Campbell (William Dysart) with a view to using his skills to restore electrical power to the nation. However, they discover Alec to be withdrawn and unco-operative and still mourning his long dead wife. When he continues to refuse to help, Frank resolves to take stronger measures which involve some pethadine and Jenny...

Charles, Jenny, Hubert, Frank and Alec arrive at a settlement based at an old coal mine. The settlement's leader, Leonard Woollen, is anxious to get the mining equipment working again and enlists Alec and Charles's help. Another man, Sam Mead (Robert Gillespie) is opposed to the idea fearing a return to the age before 'the death'. Jenny is becoming increasingly emotional about the absent Greg. Charles pushes her too far in relation to Alec...

Greg is looking for a Dr.Adams who he thinks is being held captive. He is attacked by four men who steal all his notes on the settlements he has visited. He survives the encounter but runs into further danger when he finds Dr.Adams, who has contracted smallpox. Greg must now wait until the incubation period is over to see if he has contracted the disease...

Charles, Jenny and their ever growing party are heading North to Scotland, when they receive a message to meet Greg at a place called Felbridge. Jenny thinks it will be another wild goose chase. They later discover that Agnes has devised their reunion and that she plans to set up a new government for the nation at Felbridge under Greg's name. However, Greg is curiously absent from the proceedings...

Charles, Jenny, Hubert and Alec finally arrive in Scotland and make for a hydro-electric power station to switch on the power. However they do not count on the intervention of a nationalistic Scotsman who sees their efforts as stealing Scottish electricity for England. Nor do they realise how far Sam will go to prevent the return of power to the nation...