But as the hours turn into days, Inspector Guy Northeast begins to suspect that she may have been the victim of foul play. On the surface, Delia appeared to be a quite ordinary middle-aged Englishwoman content to spend her evenings with her sisters and mother and her days with her beloved horses. But Delia led a secret life -- and Guy turns up more than one person who would like to see Delia dead. Except Delia wasn't the only person with a secret....

Never published in the United States, They Rang Up the Police appeared in England in 1939 and is the first of two books to feature young Inspector Guy Northeast, who, as critics Jacques Barzun and Wendell Hertig Taylor point out, "marks a departure from the norm of the thirties".