When does The No. 1 Ladies' Detective Agency return?

The No. 1 Ladies' Detective Agency is a television comedy-drama series based on the novels of the same name by Alexander McCall Smith. The novels focus on the story of a detective agency opened by Mma Ramotswe and her courtship with the mechanic Mr. J. L. B. Matekoni. The series was filmed on location in Botswana and was seen as one of the first major television productions to be undertaken in the country. HBO announced in summer 2011 that the series might continue as two or more standalone films.