Alec and June meet in a small English town in 1927 when they are children. They grow up and grow close, and their love feels inevitable, until war separates them. Alec becomes an RAF pilot; June, a codebreaker at Bletchley Park. Though they're separated for years at a time, they share the certainty that their love will endure. But when they're reunited after the war, they return deeply changed by their experiences. The couple must decide how much of themselves to reveal to the one they love, which dreams can be sacrificed, and which secrets are too big to bear alone.