After Munro summons Holmes and Watson, the three enter the cottage, brushing aside the entreaties of Effie Munro. They find the strange yellow-faced character, and Holmes peels the face away, showing it to be a mask, and revealing a young girl who is half-black. It is then revealed that Effie Munro's first husband was John Hebron, an African-American lawyer; he did die in America, but their daughter, Lucy, survived. At the time Effie came to England, she could not bring Lucy with her, as the child was still ill enough that the transition might have exacerbated her state. But later, after she and Grant were married, Effie got word that Lucy was alive and well. Upon hearing of this, Effie became overcome with desire to see her child again, so she asked for the hundred pounds and used it to bring Lucy and her nurse to England, and installed them in the cottage near the Munro house. She feared, however, that Grant might stop loving her if he found out that she was the mother of a mixed race child, so all the while, she had made every endeavour to keep Lucy's existence a secret.