故事的主人公是四个高中生,为了能轻松修够学分最终顺利毕业,他们决定挑选一些看上去比较容易过的课程项目,其中就包括招待外国交换生。虽然国籍不同,但是青少年的烦恼和快乐都是大体相似的。从最初的陌生腼腆到后来渐渐熟络,外国交换生与主人公们都从对方身上学到了不少东西……。When Watson reads from the newspaper there have been two similar murders near Whitechapel in a few days, Sherlock Holmes' sharp deductive is immediately stimulated to start its merciless method of elimination after observation of every apparently meaningless detail. He guesses right the victims must be street whores, and doesn't need long to work his way trough a pawn shop, an ...。