Rent The Danish Girl
In the 1920s, Greta, an artist, marries Einar, who models for her--sometimes in women's clothes, which awakens his desire to actually become a woman. Greta supports him, and they find a surgeon who is willing to perform the operation--an event that, understandably, changes their relationship irrevocably. The novel is based on the true story of Danish painter Einar Wegener and his wife. A New York Times Notable Book for the year 2000.