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 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...

Abby is tiring of life at the grange and her thoughts turn to resuming her search for her son. After a row with Greg over the taking in of a sick girl, Ruth. Abby sets off for Waterhouse to find Jimmy Garland. Meanwhile Greg and Arthur make their first attempts towards federating the communities that have sprung up since 'the death'. When Ruth recovers, Greg and Jenny discover she is a former medical student and that she has some startling news for them...

A pregnant young woman called Laura arrives at the grange, seeking shelter from her partner, a man called Huxley, who wants her back but doesn't want her unborn child. Abby and Greg argue as to whether she should be allowed to stay. When John and Lizzie unknowingly give away the fact that Laura is staying at the grange, Huxley embarks on a series of reprisals until the community agrees to give up Laura to him....

Ruth invites members of a failed community to join the Whitecross settlement, despite the fact that they have been exposed to a disease. When Arthur and Jack contract the illness she fears she may have made an error in judgement. Meanwhile, the self appointed leader of the young new arrivals, Mark Carter (Ian Hastings), advises Charles on where he is going wrong agriculturally and draws up a new plan for him to examine...

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...

Crippled Vic attempts to commit suicide because he is feeling increasingly useless. Greg tries to convince him that his teaching of the children is an important job. When Anne Tranter arrives at the grange she is shocked to discover that Vic is alive and that Greg therefore knows of her heartless actions when they first met (in Genesis). When Vic learns that Anne is actually staying at the grange he becomes intent on ultimate revenge...

Petty arguments are dividing the ever growing community at the grange. Abby decides on a party on May Day as a remedy. The pary goes well and spirits are raised. However, the next morning they awake to discover that one of their number has been brutally murdered. The community meet to decide how to deal with the person they believe to be the murderer...

Abby, Jenny and Greg have made an abandoned church their base. Abby hopes to find her son Peter. They make a trip to a nearby supermarket to gather some food supplies and encounter some of Wormley's men who insist they leave their loot. Jenny and Greg overpower them and they escape. The men are intent on revenge and begin to search the countryside for the trio...

A virulent flu bug is spreading through the country like wildfire. Abby Grant (Carolyn Seymour) and her husband David (Peter Bowles) are aware that the flu has reportedly claimed millions of people's lives in China, but they don't think that could happen in England. Abby becomes ill and takes to her bed. Meanwhile Jenny Richards (Lucy Fleming) learns from a doctor that this is no flu bug and that hundreds are now dying. Acting on his advice she flees London for the countryside. Abby wakes days later and fears that she may be the only one left alive...

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 and Pet are returning from a salt collecting expedition when they meet two other travellers who become very ill. They take them to a nearby settlement in an old army camp. The community there is run like a police state where eugenics, euthansia and religious fervour all hold sway. The people there are led by a charismatic man called Max Kershaw and his second in command Joy Dunn. Pet is fearful that they may not be allowed to leave, whilst Charles is summoned to speak to the community's council...

Abby is still searching for Peter and returns to his school. Meanwhile Jenny and Greg meet two children, John and Lizzie who are keen to join them. They have a lead which may help in the search for Peter. Before 'the death' some individuals, who were nicknamed 'the angels' by the press, foresaw the impending catastrophe and isolated themselves. It is thought that some of the boys from the school went to find them. Jenny, Greg and the children make an abandoned house their base, whilst Abby sets off to find 'the angels'...

When a former vicar, Lewis Fearns (Roy Herrick), arrives at Whitecross and reveals his occupation, community life is disrupted. Charles becomes worried that the distractions caused by Lewis may be very damaging given the hard work that is required to sustain the settlement. Is there a place for God and a return to religion in the new order of things..?

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...

When Mina (Delia Paton), an eccentric member of the community at Whitecross, spurns Hubert's unwelcome attentions, he begins to spread vicious rumours that she is a witch. When John and Lizzie see Mina bake a clay figure representing Hubert and Pet and Peggy add up other recent events, they begin to believe that Hubert may be right......

Greg travels to a community at Whitecross to trade with its leader Charles Vaughan (Denis Lill) who he last met at Mardell. Jenny is now pregnant so Greg also seeks news of Ruth's whereabouts, as she promised to return to help with the birth. Whilst Greg is away, a fire destroys the grange. The survivors of the blaze are soon reunited with Greg, who leads the way back to Whitecross where they hope to stay, at least until Jenny has had her baby...

When there are complications after the birth of Jenny's baby, Ruth knows that the only course of action is to locate some medicine to treate her. Paul, who is now in love with Ruth, elects to go on the dangerous journey into Birmingham to find what Ruth needs. Eventually Paul returns, but he reveals that he doesn't fell too well. Ruth isolates Paul in a barn to prevent the possible spread of infection and begins to treat Jenny whose condition has worsened...

When Sally becomes pregnant by Alan, Charles is overjoyed, thinking this will encourage a baby boom at Whitecross. Sally wants to live with Alan as his wife but he has other ideas. As the situation becomes more tense, Charles crosses swords with Melanie, Ruth and even Pet...

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...

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...

Abby, Greg and Jenny are still searching for Peter. Greg and Jenny are becoming closer. They meet a man called Charles Vaughan (Denis Lill), a self-sufficiency expert, who has sobering theories about the number of survivors of 'the death' and their prospects for the future. He invites them to join his community, but it soon becomes clear that he has a hidden agenda which could involve Abby...