Rosemary Barton dies at her birthday dinner - suicide by cyanide in champagne. Less than a year later her husband receives letters stating Rosemary was murdered and he calls in Colonel Race to help him figure out why and whom.
This was a good story - Race doesn't have much more than a cameo in it for most of the book. It's more him trying to convince George to leave things to the police. George doesn't and this gets him killed, so Race steps in to solve the murder, helped by Rosemary's sister Iris's fiance Anthony Browne.
I really like the name of one of the antagonists - Ruth Lessing. Her character was truly ruthless and foolish.
