This book is formatted as journal entries from the author's month-long expedition into the Aleutian Islands to investigate the declining population of the Stellar's sea lion. The authors begins by giving the readers an illustrated map of the islands the group will the traversing and the vessel that will carry them, as well as a written description of the beginning of her journey. Each entry details what she saw/did each day. Her entries also include extremely informative descriptions of the species and animals native to the region they are traveling in, including information from food sources to migration habits. These are accompanied by illustrations which enable the reader to clearly identify said animal. The author also describes the marine ecology of the Arctic region, accompanied by illustrations. The book is not solely science, Webb does include her own observations and feelings, providing the reader with an image of life on a scientific expedition.