Manchester by the Sea follows the story of Lee Chandler, a janitor living a solitary life in Boston. When his brother passes away, Lee is named the guardian of his teenage nephew, Patrick. Forced to return to his hometown, Lee must confront his painful past and the reasons that led him to leave. As he navigates his new responsibilities, Lee grapples with grief, guilt, and the possibility of redemption. Through a series of flashbacks, the film unravels the tragic events that shaped Lee's life and his journey towards healing and acceptance.