Lorac, the pen name of the British writer Edith Caroline Rivett.

[1][2] It is the eighth book featuring Chief Inspector MacDonald of Scotland Yard who appeared in a lengthy series of novels during the Golden Age of Detective Fiction.

[3] It received a positive review in The Sunday Times from Dorothy L.

[4] Its success led to Lorac switching publishers from Sampson Low to the more prestigious Collins Crime Club soon afterwards.

At the Regency concert hall in Regent's Park, the body of a man Anthony Loudon is discovered in the organ loft.