A tale of friendship between two unlikely pen pals: Mary, a lonely, eight-year-old girl living in the suburbs of Melbourne, and Max, a forty-four-year old, severely obese man living in New York.

In 1970s Australia, Grace's life is troubled by misfortune and loss. After their mother dies during pregnancy, she and her twin brother, Gilbert, are raised by their paraplegic-alcoholic former juggler father, Percy. Despite a life filled with love, tragedy strikes anew when Percy passes away in his sleep. The siblings are forcibly separated and thrust into separate homes.