'The Salmon of Doubt: Hitchhiking the Galaxy One Last Time' (2002) by Douglas Adams

'The Salmon of Doubt: Hitchhiking the Galaxy One Last Time' is a posthumous collection of previously published and unpublished material by Douglas Adams. It consists largely of essays, interviews, and newspaper/magazine columns about technology and life experiences, but its major selling point is the inclusion of the incomplete novel on which Adams was working at the time of his death, The Salmon of Doubt (from which the collection gets its title, a reference to the Irish myth of the Salmon of Knowledge).