Yu Xiaoqin steals money from her father and blames on her sister Tao Lan, who accidentally kills her sister while attempting to prove her innocence. After 17 years in jail, Tao Lan is escorted by a guard only to find her home long demolished. The two go to the new address of her ageing parents, and the guard becomes witness to the family's difficult reunion.

该剧改编自紫金陈推理小说《坏小孩》 ，讲述了沿海小城的三个孩子在景区游玩时无意拍摄记录了一次谋杀，他们的冒险也由此展开。扑朔迷离的案情，将几个家庭裹挟其中，带向不可预知的未来......