Blue Shoes and Happiness is the seventh in The No. 1 Ladies’ Detective Agency series of novels by Alexander McCall Smith, set in Gaborone, Botswana, and featuring the Motswana protagonist Precious Ramotswe.
Mma Ramotswe is asked to investigate a cook who is being blackmailed, and a doctor whose nurse believes he is doing something illegal. She discovers the identity of the blackmailer, who is a newspaper agony aunt abusing the confidences of her correspondents, and forces her to stop. The doctor is selling generic drugs at the full cost to his patients, and she causes him to be reported. During the investigation she becomes more aware of her excess weight and its health risks and even tries to diet, but decides the most important thing is to be herself and happy.