Like the endless cups of bush tea guzzled by Precious Ramotswe, there is something familiar and comforting about a new instalment in the No.1 Ladies Detective Agency series.

The Double Comfort Safari Club may not break any new ground – Mma Makutsi is still impatient for her wedding to actually happen, Mma Ramotswe still solves all the world’s problems with sedate and reasoned deduction – but who cares when the formula is so endearing and successful?