Mariella Frostrup talks to Rachel Johnson about Winter Games, her book set across two time zones. She looks at the challenges of writing prequels and sequels with Ronald Frame who has written Havisham, a prequel of Dickens' famous jilted bride in Great Expectations, and Geraldine McCaughrean who wrote the authorised sequel to JM Barrie's Peter Pan. And a readers' guide to the famous detective fiction writer Dashiell Hammett.
