Confessions of a Hong Kong Naturalist is a natural history memoir, tracing the journey from novice to expert of an aspiring naturalist, Graham Reels, as he follows a trail of discovery into the miraculously fascinating and diverse world of Hong Kong's wildlife.

The memoir falls naturally into two parts, the first covering the seven-year period 1988-1995 in which Reels gained the knowledge and experience that qualified him to undertake the Hong Kong Biodiversity Survey in 1995-1998. Early chapters include descriptions of work as a research assistant at Hong Kong University, an M.Phil. study from a hut at Mai Po Marshes Nature Reserve, a survey of Hong Kong's freshwater wetlands, and work at Kadoorie Farm & Botanic Garden. The territory-wide Biodiversity Survey is covered in the second half of the book.

Throughout the memoir, different animal species that Reels encountered (mammals, birds, reptiles, amphibians, insects) are named and described, and their ecological or behavioural attributes discussed in a lively and informal manner. Similarly, a range of fascinating human characters whose lives intersected with the author's in his study of Hong Kong's wildlife are introduced and engagingly portrayed.