Paperback edition of McCall Smith's 13th book in }The No 1. Ladies' Detective Agency{ series, featuring Mma Ramotswe. Mma Ramotswe and Mma Makutsi have long relied on the classic guide }The Principles Of Private Detection{. When the author, Mr Clovis Andersen, comes to Botswana on holiday, he calls and announces himself. McCall Smith's books have sold more than 20 million copies worldwide.