Shortly after arriving in Sydney, Governor Hunter invited Flinders and Bass to determine whether a recently discovered inland river flowed into Botany Bay. Although the expedition would have been best undertaken by boat but no craft was available, so Hunter told them to make the survey on land. Bass had brought a rowing boat out from England on the Reliance and because of its size he named it Tom Thumb. This would not have been their craft of choice, nonetheless they opted to use it and despite serious misgivings Hunter eventually gave his consent. This book is about Flinders adventures on Tom Thumb.