Gaslight

In the late 19th century, Paula Alquist, a music student in Italy, gives up her studies after falling for the charming Gregory Anton. They tie the knot and relocate to England, settling in the home Paula inherited from her aunt, a celebrated singer who was mysteriously killed there a decade earlier. Paula becomes convinced that the gaslights are dimming and odd noises are coming from the attic each night, but Gregory persuades her that it’s all in her mind. At the same time, Brian Cameron, an inspector from Scotland Yard, grows concerned for Paula’s wellbeing.

Gaslight (1944) is available here. With cineby and 123Movies, you can stream the gripping tale of suspicion and intrigue, watching online for free.