The Phantom of the Opera by Gaston Leroux

That tragic evening was bad for everybody. Carlotta fell ill. As for Christine Daaé, she disappeared after the performance. A fortnight elapsed during which she was seen neither at the Opera nor outside.

Raoul, of course, was the first to be astonished at the prima donna's absence. He wrote to her at Mme. Valérius' flat and received no reply. His grief increased and he ended by being seriously alarmed at never seeing her name on the program. Faust was played without her.