When Kate and Sammy are kept in after school they see something so odd they have to investigate further. Together with Kate's brother Duncan they are soon involved in a strange and dangerous situation.
The Group who come from 600 years in the future have forced the children into keeping quiet about them. They have transposed the mind of one of their men into Sammy's dog.
Kate and Sammy have seen a strange man keeping watch in the street.
Duncan, much to Kate's surprise and Sammy's admiration, has penetrated into the Gala headquarters. He believes he has passed unnoticed and escaped without being recognised. But the Gala's security is better than he thinks.
Duncan, with Sammy, Kate and Radnor's help, has, at last, got hold of the piece of equipment their friends, The Group, so desperately need.
Duncan has arrived at the Group's HQ and everything is set for Levin's return to the future. Sammy has been forced to reveal the Group's secret hideout.