Children's writer Cressida Cowell and restaurateur Romy Gill choose favourite books, in conversation with Harriett Gilbert. Cressida's choice is The Joy Luck Club by Amy Tan, the story of the fractious relationship between a first-generation Chinese immigrant to the USA and her Americanised daughter. Romy Gill selects The Namesake by Jhumpa Lahiri, a novel that follows a similar theme of conflicting Eastern and Western cultures, and Harriett opts for Managing Expectations, the autobiography of actress Minnie Driver