Night Watch is the 29th novel in Terry Pratchett's Discworld series, published in 2002. The working title for this book was The Nature of the Beast, but this was discarded when Frances Fyfield published a book with exactly that title in the UK in late 2001. The protagonist of the novel is Sir Samuel Vimes, commander of the Ankh-Morpork City Watch. A five-part radio adaptation of the novel was broadcast on BBC Radio 4 from February 27 2008 - it featured Philip Jackson as Sam Vimes and Carl Prekopp as young Sam, and referenced the similar theme of a policeman unexpectedly being sent back in time from the series Life on Mars.