It is 1956. Freddy and Polly have never minded helping their genius father with his experiments. Even when that means being put into cryonic suspension having their hearts frozen....

Now it is 2009. Ben and Rachel have resigned themselves to a long, dull summer when they find the hidden underground vault in the garden and inside it two frozen figures, a boy and a girl....

Can Polly and Freddy adapt to the 21st century? Will their bodies survive having been in suspension for so long? And what happened to their father - and why did he leave them frozen in time?