Gaslight.

World-famous opera singer Alice Alquist was murdered at Number 9 Thornton Square in London. Paula Alquist's niece, Paula, was raised by her aunt following Paula's own mother's death years earlier. Paula is sent to Italy to train to be an opera star with the same teacher who once trained her. Paula studies with Gregory Anton for years, all the while trying to forget that terrible night. Paula does not know that her husband is in fact Sergius Bauer, her aunt's murderer.