Filmed over 4.5 years, Why Knot weaves the history of monogamy with the story of one filmmaker's experience with an open relationship. When his brother decides to get married, Dhruv's Indian family pressures him to follow suit. Amid wedding preparations, Dhruv turns the camera on his family and ex-lovers to reveal the fabric of monogamy, the truth of infidelity and the reality of jealousy.