Since the discovery of their father's time machine in 1915, Henrietta and her brother Tom have secretly travelled back through the ages to experience history at first hand. In this journal, Henrietta has recorded her field notes and observations of their exciting adventures in the prehistoric era of the dinosaurs. The journal is not the ramblings of an over-imaginative teenager, but an accurate, illustrated record of real creatures living in an extraordinary time. This fascinating science-faction account will not only delight, but will also help to further the reader's knowledge of dinosaurs.