Undersea Jewels is a 'ready reckoner' guide to the nudibranchs of south-eastern Queensland. The book is easy to use and, as these animals are among the most colourful and charismatic of marine creatures, a pleasure to peruse. It covers 277 species of nudibranch (in the broad sense, i.e. = opisthobranchs) all found on the Sunshine Coast of southern Queensland, but most also found elsewhere in Australian seas and many occurring in the broader tropical Indo-West Pacific Region. Beautifully illustrated, with photos by naturalist/diver Gary Cobb and colleagues, and text by marine biologist, Richard Willan, the book provides a bridge between professionals and amateurs, and will do much to raise and enhance awareness of the marine invertebrate community, and to encourage its conservation.