The Love Song of Miss Queenie Hennessy can be looked at as a companion book of sorts to The Unlikely Pilgrimage of Harold Fry. It is a look into Queenie's life in parallel to Harold's walk. It also provides insight to their previous relationship and how they lost touch for twenty years. 
 A sweet, sad and often touching book on reflection, regret and reinvention in our lives. The very last chapter does contain a slight twist that I did not see coming. Altogether a good read!