Reclusive small town locksmith, A.J. Manglehorn (Al Pacino) has never quite recovered from losing the love of his life. He feels closer to his beloved cat than the people around him and prefers to find comfort in his work and daily routine. Still, he continues to form tenuous forms of somewhat human connections, maintaining intermittent contact with his son and establishing a cautious friendship with a kindhearted woman from the local bank. As this solitary man approaches the possibility of new love, he finds himself at a crossroads between staying mired in the past and embracing the present.