一个十岁女孩在一场纵火火灾中丧生,尽管哈里·博斯警探受到了重重阻力,但是他不顾一切困难,誓要将杀死女孩的凶手绳之于法。警探杰利·艾德格正在应对射杀雅克·艾威尔带来的后果,他在这过程中慢慢崩溃。麦迪协助哈妮·钱德勒办理一桩备受瞩目的案件,这个案件牵扯到了博斯,并让他们成为危险罪犯的目标。第七季为本剧最终季。New Year's Eve 2019. While Los Angeles celebrates, a fire breaks out in an East Hollywood apartment building killing several residents including a ten-year-old girl. When it’s determined to be arson, Detective Harry Bosch arrives on the scene but his partner, Detective Jerry Edgar, is noticeably absent.