Stradella by F. Marion Crawford — Read

Gambardella knocked at the door of San Domenico twice in quick succession, and then again once after a short interval. For reasons known to himself he had not hesitated to begin his inquiries for Ortensia at the old Dominican convent then occupied by the nuns of Saint Ursula, and it was at once apparent that his knock inspired confidence. Instead of drawing back the small sliding panel in the weather-beaten door to see who was outside and to ask his errand, the portress opened the postern on one side almost immediately, without showing herself, and Gambardella slipped in unchallenged and shut it after him.

He found himself in a high and vaulted vestibule which received light from the cloistered garden round which the convent was built, and he was at once confronted by the portress, who seemed much surprised when she saw that she had admitted a fine gentleman.