[1] Both this and his following novel The Missing Partners revolve around potential miscarriages of justice.

[2] It was published in the United States by Payson and Clarke in 1927.

[3] A success it launched his career as one of the prominent writers during the Golden Age of Detective Fiction.

The title refers to the traditional question asked in court by a judge of the jury to establish whether they have reached a unanimous verdict.

Inspector Dobson and his superior Superintendent Fraser are called in to investigate when a wealthy financier is found dead in the study of his London home.