Constance Briscoe and Angela Saini

Harriett Gilbert and her guests - former barrister, Constance Briscoe and science journalist, Angela Saini - discuss favourite books by Jill Paton Walsh, Isaac Asimov and Muriel Spark.

Constance's choice: 'Knowledge Of Angels' by Jill Paton Walsh Publisher: Black Swan

Angela's choice: 'Foundation' by Isaac Asimov Publisher: Harper Collins

Harriett's choice: 'Curriculum Vitae' by Muriel Spark Publisher: Carcanet

First broadcast on BBC Radio 4 in June 2012.