Winsey's search for his future brother-in-law’s murderer leads him to a farmer who's pathologically jealous of his younger wife.

Lord Wimsey investigates his sister's flirtation with Bolshevism and a romantic involvement with a Communist activist.

The Duke does not wish Mrs. Grimthorpe to be called as an alibi witness in his murder trial, but if Peter does not bring a vital piece of evidence, he will have to.