Mrs Carson

In the short story The Submarine Plans, Mrs Carson was a woman well-known in London society although, as Lord Alloway told Poirot, surprisingly little was known about her, where she came from and what her past life had been. She was especially active in foreign office and diplomatic circles and thus aroused the suspicion of the Secret Service. At the time the submarine plans were stolen, Lord Alloway had invited her as a guest at his country "Sharples" so that she might be observed "at close quarters".

Hastings described Mrs Carson as a woman of about thirty five, with golden hair, and "a slight tendency to embonpoint."