Poirot, aged and bored, jumps at Supt. Spence??????s request for help, and travels to the village of Broadhinny (one of Christie??????s few working-class backgrounds), going as himself, ??????pretending that [he] know[s] a great deal ?????? [is] not satisfied about the verdict in the McGinty case ?????? [has] a very shrewd suspicion of what really happened [for] there is a circumstance that [he],