Alan Johnson is a successful dentist living in New York City who feels trapped in the monotony of his daily routine and strained by the demands of his professional and personal life. One day, he unexpectedly encounters Charlie Fineman, his former college roommate, who is now a troubled loner disconnected from society. Alan learns that Charlie lost his wife and three daughters in the September 11 attacks, and has since withdrawn from the world, struggling with profound grief and post-traumatic stress disorder. Despite Charlie's initial resistance, Alan is determined to reconnect with him and offer support, becoming increasingly invested in helping his old friend find a way to cope with his overwhelming sorrow.

As Alan spends more time with Charlie, they rekindle their friendship and embark on a journey of healing and rediscovery. Alan introduces Charlie to his own family and friends, hoping to reintegrate him into society. Meanwhile, Alan gains new insights into his own life and relationships, realizing the value of human connections and the importance of confronting one's own emotional struggles. Through their interactions, both men confront their past traumas and begin the process of healing, ultimately finding solace and strength in their renewed friendship.