Blue Shoes and Happiness by Alexander McCall Smith

Life is good for Mma Ramotswe as she sets out with her usual resolve to solve people's problems, heal their misfortunes, and untangle the mysteries that make life interesting. And life is never dull on Tlokweng Road. A new and rather too brusque advice columnist is appearing in the local paper. Then, a cobra is found in the offices of the No. 1 Ladies' Detective Agency. Recently, the Mokolodi Game Preserve manager feels an infectious fear spreading among his workers, and a local doctor may be falsifying blood pressure readings. To further complicate matters, Grace Makutsi may have scared off her own fiance. Mma Ramotswe, however, is always up to the challenge.