在这部信使：蜻蜓剧情片中,拼搏奋斗的艺术家Larsen的妈妈从来不懂得她。所以当Anna回到家乡明尼苏达州去帮助她生病的母亲，她随身带了几年来所积攒的一大堆行李。但是当重新发现一个她小时候的神秘邮箱，并且寻求解开邮箱的神秘面纱时，Anna所面对的现实是，可能她才是那个不懂得她人的人。
Struggling artist Anna Larsen's mother has never understood her. So when Anna returns home to Minnesota to help care for her ailing mom, she brings years of family baggage with her. But the rediscovery of a magical mailbox from her childhood and the search to solve its mystery forces Anna to confront the fact that maybe she's the one who doesn't understand.
