郊区小乡村，车轮制造商罗杰·艾克罗伊德被人刺死在书房里，一把铮亮闪光的刀子从背后刺进了他的胸膛，当场毙命。 一个残忍而狡猾的凶手充当了这桩谋杀案的主角，我们有充分的理由相信，如果不是退休后隐居在此的波罗亲自出马，谁想到真凶竟是…
Two dogs escape from a British government research lab. As the authorities hunt down the canine fugitives, the two dogs search for their original master and for a place where they'll be free from the iniquities and cruelties of Mankind.