The Camera Fiend by E.W. Hornung

It was a normal elderly gentleman, with certain simple habits, but no little distinction of address, who welcomed the schoolboy at his breakfast-table. The goblin inquisitor of Hyde Park had vanished with his hat and cloak. The excited empiric of the dark-room was a creature of that ruby light alone. Dr. Baumgartner was shaved and clad like other men, the iron-grey hair carefully brushed back from a lofty forehead, all traces of strong acids removed from his well-kept hands. There was a third person, and only a third, at table in the immature shape of a young lady whom the doctor introduced as his niece Miss Platts, and addressed as Phillida.

Pocket thought he had never heard of nobler atonement for unmitigable surname. He could not help thinking that this Phillida did not look the one to flout a fellow, after the fashion of the only other Phillida he had ever heard of, and then that it was beastly cheek to start thinking of her like that and by her Christian name. But he was of the age and temperament when thoughts will come of contact with young animals of the opposite sex. He looked at her sidelong from time to time, but all four eyes dropped directly they met; she seemed as shy and uninteresting as himself; her conversation was confined to table attentions to her uncle and his guest.