There are four 'Wonder Voyages' recounted in this book. The author explains how, rather like Lewis Caroll, he entertained his children at night with stories of imaginary voyages that he had made. He had always said there would never be a 100th voyage but, on reaching 99 and offering no further story, the children revolted so he had to resort to tales of other wonderful voyages already told, and chose to start with the four in this volume.