Murder Must Advertise is a 1933 mystery novel by Dorothy L. Sayers, the eighth in her series featuring Lord Peter Wimsey.

The doctor states that death was caused either by a broken neck, due to his landing on his head at the bottom of the stair, or by a wound of the right temple.

Looking through Dean's desk, Bredon discovers a partially-completed letter to the firm's proprietor, Mr Pym, telling him that something 'undesirable' is going on in the office.

After having a drink in a Covent Garden pub, newspaper reporter Hector Puncheon discovers that someone has slipped cocaine into his coat pocket.

Chief Inspector Charles Parker, Wimsey's brother-in-law, suspects that Puncheon has stumbled on Milligan's drugs gang, but finds no further suspicious activity there.

Searching the man's flat, Wimsey and Parker discover a phone book with the names of many pubs ticked off, including the one in Covent Garden.

Milligan is killed in an 'accident', and Wimsey – in his identity as Bredon – is nearly jailed for the murder of Dian de Momerie (also the gang's work).

[2] Writing in 1993, the biographer Barbara Reynolds noted that "Sayers herself disliked the novel, which she wrote quickly in order to fulfil her publisher's contract, and was unsure whether it would ring true with the reading public".

With all its defects of realism, there had been some measure of integral truth about the book's Idea, since it issued, without my conscious connivance, in a true symbolism".

[8] Murder Must Advertise was adapted by Bill Craig for television in 1973 as a BBC TV mini-series starring Ian Carmichael as Lord Peter Wimsey.