在这部博斯科姆比溪谷秘案悬疑/犯罪片中,一场激烈的争吵过后，麦卡锡抛下怒气冲冲的儿子外出赴约，随后不久，他的尸体在一个池塘边被发现，并脑骨碎裂，死状凄惨。有人证实：麦卡锡出门时，他的儿子背着枪尾随其后…
When Sherlock Holmes receives an urgent plea for help from a young woman, Alice Turner, he interrupts Dr. Watson's holiday and they set off. Alice wants Holmes to exonerate her childhood friend James McCarthy, whom she loves dearly and who has been charged with murdering his father, William McCarthy. She is convinced of his innocence and believes the murder charge is due in part to his refusal to reveal what he and his father were arguing about the day the elder McCarthy was killed. They were in fact arguing about James' refusal to marry her. After interviewing him, Holmes also believes him to be innocent. The solution to the crime is to be found in events that began long ago when the elder McCarthy and Alice's father, John Turner, both lived in Australia.
青梅救竹马，福尔摩斯又破坏华生假日。
