The newest release of Alexander McCall Smith's No 1. Ladies' Detective Agency series, To the Land of Long Lost Friends, is a good one. It's about Precious Ramotswe, who takes a case for a childhood acquaintance, then realises how tricky it is to work with family. Botswana's premier detective discovers that her friend's daughter seems to be involved with a charismatic preacher — and not necessarily in an innocent way.