欧内斯特（迈克尔·珊农 Michael Shannon 饰）同儿子杰罗姆（柯蒂·斯密特-麦菲 Kodi Smit-McPhee 饰）、女儿马莉（艾丽·范宁 Elle Fanning 饰）一起过着相依为命的生活，虽然经济拮据生活清苦，但一家人好歹紧紧的联结在一次，互相支撑着，鼓励着。 欧内斯特拿出了家里最后的一点点钱买了一头机器骡子，他和杰罗姆牵着骡子给在山上工作的矿工们运送口粮，以此获得报酬维持生计，可以这么说，这头破败不堪的骡子是全家人最后的希望了。费莱姆（尼古拉斯·霍尔特 Nicholas Hoult 饰）一直将欧内斯特一家人视作眼中钉肉中刺，只因为他们目前居住的那一片土地曾经属于自己的父亲。这一次，费莱姆将复仇的目标放到了落单的马莉的身上。
After the parties, jobs, and hook-ups well into their thirties, eight friends are trying to hold on to their group as they learn that while growing up is hard, staying close is harder.
Dragonfly is about unlikely friendships. Seeing a lack of care, COLLEEN decides to care for ELSIE. Never sure of her motivations, Dragonfly is a chillingly tense narrative that will make you question your preconceived judgements.
