A Killing in the City. Kendall, #4

"To make a Killing in the City" is a phrase often used in the financial world, to indicate making a large profit on investments, or through dealings on the Stock Market - the bigger the profit the bigger the killing. However Tom Kendall a private detective on holiday in London, has a different kind of killing  in mind when he hears about the death of a fellow passenger who travelled with him on the plane from Miami.
It was suicide apparently, a simple overdose of a prescribed drug. Kendall immediatly offers his help to Scotland Yard. He is shocked when he is told that his services will not be required. They can manage perfectly well without him, thank you