In 1928 a woman is photographed walking through the back of Charlie Chaplin's movie set. She is clutching a small object to her left ear and chattering into it. Sounds innocuous and perhaps it is. Or it could be a careless time traveller caught on film. Either way it sets the imagination on fire.
What a great concept for a novel! I just love hearing things like this. They are so inspiring.
Charlie Chaplins 'Circus' timetraveller youtube video.