51 Birch Street is a documentary film that follows filmmaker Doug Block as he uncovers the secrets of his parents' seemingly perfect marriage after his mother's sudden death.
As Block goes through his parents' belongings, he discovers journals and letters that reveal a complex and troubled relationship that was kept hidden from him and his siblings.
Through interviews with his father and other family members, Block delves deeper into the past and learns about his parents' struggles, infidelities, and ultimately, their deep love for each other.
The film explores themes of family dynamics, secrets, and the complexities of marriage, leaving viewers questioning the true nature of relationships and the stories we tell ourselves about our loved ones.