肖恩（奥多德饰）是 10 岁的马丁·穆恩（Martin Moone）的想象中的朋友，马丁·穆恩是爱尔兰小镇一个家庭中最小的孩子。在一位想象中的朋友的帮助下，马丁对生活有了独特的看法。他的想象力不仅体现在他幼稚的绘画中，这些绘画通过动画而变得生动起来，也体现在他违背肖恩更好的判断而想出的荒谬计划中。在肖恩的帮助下，马丁作为最小的孩子在一个混乱、心不在焉的家庭中度过了生活。

The Messenger is the story of Jack’s last melt down: a story of frustration and guilt, love and betrayal, family and blame. Unwillingly becoming embroiled in the unfinished business of Mark, a journalist brutally murdered in the local park and his television presenter wife, Sarah, to whom he’s desperate to say one last goodbye, Jack finds himself getting closer to Sarah, obsessed with passing on Mark’s message. Discovering hidden secrets and lies finally pushes the fragile Jack over the edge but there is hope when his estranged sister, Emma, gets in touch. Jack starts to remember the past they shared together and as the memories come flooding back, he confronts the truth about the death of his father.