故事发生在北京，从孙女任幸（杨心仪 饰）三岁时在花鸟市场差点走失的那一天起，从农村来到北京工作的爷爷朱志根（李保田 饰）就与儿子崇义（秦昊 饰）再也没有说过话了，儿媳倩影（李小冉 饰）多年试图努力弥合家庭的裂缝而徒劳无功，而因为夫妻多年忙于工作，爱情已经变得枯萎，这个在别人眼里的幸福美满三代同堂的都...市家庭，早已濒临解体。 志根始终惦记着一个对去世妻子的承诺，把十八年前妻子送他的夜莺带回村子，让它在妻子的坟墓上飞走。这个在志根心里说了很久的旅行，在启程时发生了变故，因为儿子儿媳出差而没人照看的孙女加入了这场改变他们生活的奇妙旅程。从北京到阳朔，一路田园风景秀丽，但祖孙俩遭遇了迷路、崴脚、露宿山洞种种磨难，远离城市喧嚣融入大自然的孩子渴望着自由，“我就像只小鸟，关我的笼子打开了，我一下子就飞了出去。”这次重建亲情的契机，会给这个家庭带来什么样的改变？在都市里已经迷失脚步的夫妻能否重拾爱情？
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