Oscar Finch is a lawyer who uses underhanded methods to get his clients off, like coercing Paul Mackey, who worked for the D.A.'s office, into destroying evidence against racketeer Frank Staplin in 1969. Twenty-one years later, Mackey is chosen by a presidential candidate, Governor Montgomery, to be his Vice Presidential running mate. Finch himself hopes that he might be appointed as the next Attorney General. Staplin, facing another indictment, threatens to expose the long-ago favor and ruin Finch's and Mackey's political futures if he doesn't arrange the destruction of another document. Finch decides to murder him. He scatters cigar ashes to make it seem he was in a late-night meeting with a contributor when the murder occurred. Finch walks to Staplin's house, shoots him and makes his death look like a suicide. Final clue/twist: After Columbo learns that Staplin hadn't eaten any of the cheese on the dish at the crime scene, but that the block of cheese had had a piece bitten off from it, he assumes that the murderer must have taken a bite. CSI can fabricate a toothprint from the cheese and Columbo finds more than enough samples of Finch's toothprint on his discarded pieces of chewing gum - proving that he was at the crime scene. Directed by: Patrick McGoohan. Story by: Jeffrey Bloom.