And Another Thing... is the sixth and final installment of Douglas Adams' The Hitchhiker's Guide to the Galaxy "trilogy of six books". The book, written by Eoin Colfer, was published on the thirtieth anniversary of the first book, 12 October 2009, in hardback. It was published by Penguin Books in the UK and by Hyperion Books in the US. Colfer was commissioned to write the book by Adams' widow Jane Belson.