The Man with the Twisted Lip

A missing opium addict leads Holmes and Watson to another case missing persons case entirely - that of Neville St. Clair, a businessman who goes to London every day for work. But one day his wife spots him in the upper window of an opium den - and then he disappears completely, leaving behind only his overcoat, which is stuffed with loose change. An enormous yellow sponge proves the tool to solve the case.