The blurb for the back cover is:
George, Oliver, Isobel and Felix are happy with their lives in a small village, up in the dales. Happy that is, until one day the world suddenly comes to an abrupt stop: the clocks no longer tick, the sun doesn’t set, but worst of all their family and friends are frozen still like statues.
They are thrown into an alternate world where they must help the mysterious Black Prince defeat the evil giant Goëmagot, who has somehow stopped time as part of his plan to conquer the world.
The four children and their new friends need to solve the mystery of how the giant stopped the clocks, and along the way learn how they each have a special power of their own… But can they do this in time to rescue their families?