Dr. Septimus Dodds believes that the work of a doctor and detective are very much alike. Both must examine the evidence, sift, discard and reassemble. As a member of the medical profession he applies his theory to solving the most complicated case which has yet come his way. In doing so, he and his friend, Detective-Inspector Verity of Scotland Yard, are faced with blackmail, murder and a host of other mysterious activities.
What curious use is being made of the disused mortuary? Why did chrysanthemums suddenly change to violets? What was hidden in the secret files of the Granville Enquiry Agency? Who would want to poison such an attractive, harmless child as Felicity Blaker?
Those are some of the problems which Dodds and Verity have to solve before the curtain falls on their strange imbroglio. This is another of Sutherland Scott’s medical mysteries which, like its predecessors, combines a credible, authentic atmosphere with a rapid succession of mysterious thrills.