THE SEVENTH BOOK IN THE BELOVED NO. 1 LADIES'' DETECTIVE AGENCY SERIESThe one with the witch who flew away . . .Mma Ramotswe is happily married to Mr J. L. B. Matekoni, but her work seems more hectic than ever. Among the raft of cases coming the way of the No. 1 Ladies'' Detective Agency are blackmail, witchcraft and theft, all calling for the wisdom of a traditionally built detective.It''s enough to make her wonder what the secret of happiness is, and whether she is right to find it in small things such as a pair of blue shoes, a slice of cake, or a red sunset over Kalahari.