Percy Deforest Spock has just moved back to his hometown of Bloomington, Indiana. When a teenage boy knocks on his door, Percy is floored by the uncanny resemblance between the boy and his lost love of twenty years before. As the two grow closer, Percy relives the days when he was young and in love but is disturbed by his growing feelings for Tyler. Realizing that Tyler's resemblance to his lost love is the source of his attraction, he's able to push his desires aside and act as a mentor to his young friend. There is a secret hidden in Bloomington, Indiana; however, and as young Tyler learns more about Percy, he begins to put the pieces together. Yesterday's Tomorrow is a tale of love lost and found, of romance, of friendship, and of undying hope.