Under the Duvet is a collection of essays by Keyes, most of which were previously published in Irish or British newpapers. It does give you a deeper look into the author's life, with chapters about moving back to Ireland, her past drinking problems (the inspiration for Watermelon), what a publicity tour is like, etc. There are also loads of columns about somewhat random things- shoes, soccer, mother's day, religon, and Irishness. Everything is well-written and most are funny, but I think they're more suited to newspaper features than a whole book.
Marian Keyes (born 10 September 1963) is an Irish novelist and non-fiction writer, best known for her work in women's literature. She is an Irish Book Awards winner. Over 22 million copies of her novels have been sold worldwide and her books have been translated into 32 languages. She became known worldwide for Watermelon, Lucy Sullivan is Getting Married, and This Charming Man, with themes including domestic violence and alcoholism.