Ross finds it hard to keep the Carnmore smelting company goingand George Warleggan is determined to see it close down.George's agents outbid Carnmore so that it has no copper andGeorge attempts to talk its shareholders, who all remainsecret except Ross. Following a rockfall at Wheal Leisure Markreturns home early and discovers that Keren is not there. Hefinds her at Dwight's house and learns that they have beensleeping together.
Sarah pursues the missing Helena who is held in a farawaycompound. Sarah must use her wiles - and acting chops - todeter a Topside investigator who threatens the Leda sisters'lives. Meanwhile, Cosima appears to be rebounding from herillness, while Alison and Donnie face newfound financial woes.But when the menace of Castor rears its head once more, Sarahand her entire family must come together to survive.
In the white-hot sun of the New Mexico desert, scientist VeraBuckley watches in fascination as a mysterious object plummetsto Earth and explodes in a blinding flash, sending out a shockwave that briefly stops Vera's heart and panics her techiecoworker, Alan Harris.