The House of Whispers by William le Queux

Along the cloister they went to the great hall, where Walter's mother advanced to greet her. Full of regrets at the girl's inability to attend the dance, she handed her the missing bracelet, saying, "It is such a curious and unusual one, dear, that we wondered to whom it belonged. Brown found it when she was sweeping my boudoir this morning. Take it home to your mother, and suggest that she has a stronger clasp put on it."

The girl held the golden snake in her open hand. This was the first time she had ever seen it. A fine example of old Italian workmanship, it was made flexible, with its flat head covered with diamonds, and two bright emeralds for the eyes. The mouth could be opened, and within was a small cavity where a photo or any tiny object could be concealed. Where her mother had picked it up she could not tell. But Lady Heyburn was always purchasing quaint odds and ends, and, like most giddy women of her class, was extraordinarily fond of fantastic jewellery and ornaments such as other women did not possess.