A Caribbean Mystery

As Miss Marple sat basking in the Caribbean sunshine she felt mildly discontented with life. True, the warmth eased her rheumatism, but here in paradise nothing ever happened.
Eventually, her interest was aroused by an old soldier's yarn about a murderer he had known. Infuriatingly, just as he was about to show her a snapshot of this acquaintance, the Major was suddenly interrupted. A diversion that was to prove fatal…