The group acts quickly to pull David and Sarah back but instead they are pulled into a vortex. Seconds later they land back at the Lothian Stones near Falkirk but everything seems different and a little strange.
It becomes evident that the group is invisible and their parents cannot see them. A news report includes an eyewitness account of 'four walking into the waves'. Four? - there are six of them.
The group lands back at Glass Mountain during the eclipse and soon realise they are still being tracked. With only three days to save their own lives, the group must act fast.
There's no sign of Leon after he fell down the cliff. An argument erupts and the group splits up with Simon and Chrissie going to find Gerry while the others remain to continue the search for Leon.
Stanich tries to keep control as Shona becomes more and more erratic. It reaches crisis point when Harry and Lucy aren't at the meeting place. Chrissie and Simon arrive at the hospital but there is no sign of Gerry, at least officially.
Stanick tracks Harry and Lucy down at the lake. Shona is the second of the group to go missing and Harry's left eye is blazing red. They decide to trust Stanich and get help. Meanwhile, Chrissie and Simon continue their search for Gerry.
Harry and Lucy are worried that the others have all disappeared. They agree to return with Stanich to the Institute to talk with Professor Sharpe who admits to Lucy that there have been other recent abductees.
Simon and Chrissie have only one day left to try and stop themselves walking into the waves. Meanwhile, Harry overhears Stanich and Sharpe talking - Harry and Lucy have been lied to, and they need to escape now.
In the confusion after the accident, nobody but Harry knows that Chrissie has disappeared. He makes sure Stanich chases him while Simon helps Lucy get away.
Gerry's appearance gets mixed reactions. Lucy and Harry are pleased, but Simon is suspicious, unsure that this is the real Gerry Simmons and not a duplicate..
Gerry, Lucy, Simon and Harry are being held in an A.S.T.R.I.D. complex as captives. Simon's shirt gets caught on a nail and he hears Chrissie calling him, terrified, Simon's eye turns red.