Lost letters have only one hope for survival... Inside the Dead Letters Depot in East London, William Woolf is one of thirty letter detectives who spend their days solving mysteries. When William discovers letters addressed simply to 'My Great Love' his work takes on new meaning. Written by a woman to a soulmate she hasn't met yet, the missives stir William in ways he didn't know were possible. A love-letter to letters and a moving homage to the power of words.