Murder Must Advertise is the eighth novel in the Peter Wimsey series. In this book, Victor Dean, a copywriter in an advertising firm, fell to his death on a spiral staircase made of iron. Although many employees had considered the staircase dangerous, there have been allegations that the death was not accidental. Lord Peter Wimsey has now taken over Dean's job, under another name, and is working undercover to determine if his death was a result of foul play.