Sherlock Holmes and The House of Fear

Holmes is visited by Mr. Chalmers, an insurance agent with a strange tale. Seven single men, calling themselves "The Good Comrades", live together in the remote Scottish castle of Drearcliffe House. Recently one of the "Good Comrades" received a strange message, an envelope containing nothing but seven orange pips. That night, he was murdered and his body horribly mutilated. A few days later, a second envelope was delivered, this time containing six pips, and the recipient also died mysteriously soon afterwards, his battered corpse being recovered from the base of the cliffs. Chalmers holds £100,000 of life insurance policies on the seven men, and suspects that one is systematically murdering the others in order to collect the money, and begs Holmes to investigate.