Holmes receives two odd letters that make reference to vampires. Mr. Robert Ferguson, who comes to 221B Baker Street the next morning, has become convinced that his Peruvian wife has been sucking their baby son’s blood. Several times, she has been caught doing this by the nurse, who at first hesitates to tell Mr. Ferguson about it. Indeed, Mrs. Ferguson bribed her to keep quiet.
At last, however, she became too concerned for the child’s welfare and told Mr. Ferguson about what had been happening, and he refused to believe it. Just then, however, there was a further incident, and the wound on the child’s neck and the blood on his wife’s lips were evident. She offered no explanation, only a “wild, despairing look in her eyes”…
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