1920 London is a horror film that revolves around Shivangi and her husband, Veer Singh. They have everything going well for them in London, until Veer receives a gift from Rajasthan, India. Strange things begin to happen with him and Shivangi becomes increasingly worried as his physical, spiritual and mental condition spirals out of control.
Convinced it is black magic, Shivangi decides to seek help of a spiritual healer and guru Jai. How Jai exorcises to help the possessed man and protect his wife from evil who in turn discovers many shocking truths along the way, forms the rest of the story.