[Image courtesy : Amazon ] Sir Claude, a famous scientist, requests Hercule Poirot's help to protect the formula of a new explosive he discovered and deliver the same to a office in :London. Claude suspects that one of the inmate of his own house is involved in the mischief. Poirot agrees to help Claude and reaches his house only to find him dead. Now, Poirot is determined to find the truth behind the mysterious death. The setting of the novel is similar to Christie's other novels like Murder on the links, certain pieces of ABC's of murders, Dumb Witness (though the letter never reached Poirot in the latter case ) etc where Poirot was invited to solve a case and the invitee is dead before he could arrive. If you are a fan of Poiro...