작가의 꿈을 이루기 위해 시골을 떠나 도시로 상경한 메이비스(샤를리즈 테론)은 대필작가로서 나름 성공한 삶을 살고 있지만, 그녀의 하루가 행복하다고 생각하는 사람은 아무도 없고, 자신 또한 행복하지 않다고 느끼며 살아가고 있다. 그러던 어느날 과거 연인이였던 버디(패트릭 윌슨)의 아이 사진을 받게 된다. 메이비스는 버디를 만나기 위해 무작정 고향으로 내려가는데……
Memorial Day, 1993. When 13-year-old Kyle Vogel discovers the World War II footlocker belonging to his grandfather, Bud, everyone tells Kyle to put it back. Luckily, he ignores them. Although Bud has never talked about the war, he finds himself striking a deal with his grandson: Kyle can pick any three souvenirs, and Bud will tell him the stories behind each one. Memorial Day not only takes us on a journey into Bud's complicated wartime past, but also into Kyle's wartime future. As the two men share parallel experiences in combat, they come to realize how that magical day on the porch shaped both of their lives.
