X = Lady Helen (Nell) Cardross
Y = Mr Felix Hethersett.
Nell was looking for her husband's half-sister's unofficial fiancé,
because she feared Mr. Allandale had been lured in to an elopement by the
irrepresible Letty (the half-sister).
Nell was thrilled to find Felix at home because although she
was in the correct street she did not know Mr Allandale's exact address
in April Lady