The Pink Shop by Fergus Hume — Read

So there had been no need for Audrey to plot for the removal of Madame Coralie's yashmak. With the trifling aid of a tack, which had caught the veil when the woman rose suddenly from the divan, the truth immediately became known to the horrified and astonished girl. But was it the truth? At the first glance Audrey recognised the side face turned towards her as that of her mother. But when Madame Coralie looked round fairly, and the light, filtering through the curtains of the shop window, fell on her full countenance, then Audrey became doubtful. The wine-dark birthmark which disfigured mouth and chin and cheek had been absent from Lady Branwin's face.

"But -- but you are my mother! " gasped the girl, still struck by the marvellous resemblance to the supposed dead.