Vincent, a carpenter who returns to his small hometown to care for his younger brother, Princeton, after the death of their father. While sorting through his parents' belongings, Vincent discovers a box of old love letters that his mother and father exchanged. Inspired by their words, he begins writing his own letter, not knowing who to send it to.
Unbeknownst to Vincent, his letter ends up in the mailbox of Darci, a reclusive author who lives next door. Intrigued by Vincent's words, Darci responds, and a friendship begins to blossom through letters. As they exchange thoughts, dreams, and secrets, Vincent and Darci grow closer, despite not knowing each other's identities.