دوروتی ال. سایرز

When advertising executive Victor Dean dies from a fall down the stairs at Pym's Publicity, Lord Peter Wimsey is asked to investigate. It seems that, before he died, Dean had begun a letter to Mr. Pym suggesting some very unethical dealings at the posh London ad agency. Wimsey goes undercover and discovers that Dean …

Murder Must Advertise is a Lord Peter Wimsey mystery novel by Dorothy L. Sayers, published in 1933. Most of the action takes place in an advertising agency, a setting with which Sayers was very familiar. One of her advertising colleagues, Bobby Bevan, was the inspiration for the character Mr Ingleby.