A fascinating set of fiction from fact conversations between two extraordinary women. Margaret Thatcher is known to all. Dorothy Hodgkin should be: she is Britain's only female scientific Nobel Prize winner, a reward for her groundbreaking work in determining the structure of penicillin and vitamin B12.

 It is difficult to imagine women more different in character and political beliefs, yet their lives were closely linked: Dorothy was Margaret's tutor when the younger woman studied chemistry at Oxford University; Margaret, as Prime Minister, invited her old tutor to lunch at Chequers.

 The setting for the conversations is Margaret's fourth year at Oxford while she carried out research work in Dorothy's crystallography lab. They range widely over topics from socialism to sexual freedom. No one knows exactly what they did discuss, but the conversations are soundly based in the factual world of post war Britain and reflect the characters of these two very interesting women.