Still haunted by the case involving the murder of 11-year-old Danny Latimer, DI Alec Hardy and DS Ellie Miller pick themselves up and continue their investigative work, all the while dealing with the far-reaching consequences of the earlier case.

以隐藏拍摄的方式展示萌宠调皮行为背后的秘密，探索我们可爱宠物狂野的一面。展示某些动物的撕逼大战。不止有萌萌的喵星人和汪星人，仓鼠为何爱跑轮子、狗狗如何学会群居、猫咪怎样成为孤独的猎手。有跳水的狗、当保姆的猫、身手了得的仓鼠、被猎物戏耍的猫，相思鹦鹉为何说话、猫如何用特殊的爪子在墙上直上直下、仓鼠为什么把吃不下的东西塞一脸、和兔子究竟为啥跳。后面还介绍了秘鲁“放养的宠物狗”、挖洞打洞的宠物兔、日本猫岛上的野猫等等。