Uncle Ugstein isn't an average caveman, and Doreen Pegg isn't an average student. Put them together for a crazy adventure back in time!

Uncle Ugstein is a very unusual caveman, but even so it was very odd that he should have the idea for a vacuum-cleaner when, at that precise moment six hundred and twenty thousand years in the future, young Doreen Pegg was building her time travel machine. Jets is a series of simple stories with lots of lively pictures, ideal for children who are just beginning to enjoy reading.