July 1936 and Toronto is under a record-breaking heat wave. Charlotte Frayne is the junior associate in a two-person private investigation firm, owned by T. Gilmore. Two events set the book's plot in motion: an anti-Semitic hate letter is delivered to Gilmore, who up to now has not acknowledged his religion, and Hilliard Taylor, a veteran of the First World War requests the firm's assistance in uncovering what he believes is systematic embezzlement of the Paradise Café, which he owns and operates with three other men, all of whom were prisoners of war.