Sean Marcum is driven to find the meaning of his mother's swan song. The last words she wrote in her journal were, "Fuller Brush Man". She always communicated life's most important lessons via riddles, and he is convinced this is her finale. Sadly, Sean was never good at solving riddles, and his quest turns into an obsession, nearly costing him his marriage, and his life.
Sean's high school sweetheart, Kim, had a special bond with his mother. She was also a master at riddles. The one-time lovers have been married to others for more than 30 years. Kim's marriage has been picture perfect, Sean's not so much. Upon Kim's death from breast cancer, Sean receives a memoir she penned celebrating their failed relationship. Her book, The Road to Monticello, contains the secret to a long, happy relationship for which Sean so desperately searches. It is a lesson all of us should take to heart.