First published in 1933, Murder Must Advertise is the tenth book in Dorothy Sayers’ Lord Peter Wimsey series. In this book, Wimsey accepts an offer from the highly respectable management of Pym's Publicity, Ltd. (a light disguise for S. H. Bensons, where Sayers worked) to investigate a mystery and avert a scandal. Copywriter Victor Dean has died in a fall down the spiral iron office staircase, but he left a half-finished letter to the management hinting that something potentially scandalous is going on at Pym's. Wimsey joins the advertising firm under a pseudonym and begins his investigation!

Dorothy Leigh Sayers (13 June 1893 – 17 December 1957) was a renowned English crime writer, poet, playwright, essayist, translator and Christian humanist. She was also a student of classical and modern languages. She is best known for her mysteries, a series of novels and short stories set between the First and Second World Wars that feature English aristocrat and amateur sleuth Lord Peter Wimsey, that remain popular to this day. However, Sayers herself considered her translation of Dante's Divine Comedy to be her best work. She is also known for her plays, literary criticism and essays.