Who is Rosa Rodriguez and why did she come to Chartsville Hall? In the answer to that question lies the key to solving the murder. Inspector Ram Sen sets about diligently finding it, ably assisted by the redoubtable Mrs Tweedy, who knows everything that goes on in Shimla, though she hardly ever leaves her little cottage.
The line-up of suspects includes William Parker-Smith, the seemingly bland and boring Assistant Deputy Commissioner, his wife Helen, a very pukka English memsahib, and his acid-tongued sister, Emily; the gin-swilling Rani Sahiba of Manon and her dashing ADC, Johnny Singh; and a disgruntled domestic staff, led by Matilda, Helen s faithful ayah.