and "Keeler fans know what to expect! Each new novel that this extraordinary writer gives us presents some new baffling and astonishing problem. Here we have two such, skilfully interlocked - the case of the invisible egg, and the even more ingenious case of the safe-blower with X-ray eyes. But what can the Book with Orange Leaves have to do with such - a book of Chinese aphorisms thousands of years old? It takes a Keeler to elucidate such a web, and certain it is the author's many admirers will follow breathlessly and willingly. and "