"This Dietrichson business. It's murder, and murders don't come any neater. As fancy a piece of homicide as anybody ever ran into. Smart, tricky, almost perfect - but...I think Papa has it all figured out. It's beginning to come apart at the seams already. Murder is never perfect. It always comes apart sooner or later. When two people are involved, it's usually sooner. Now we know the Dietrichson dame is in it and the somebody else. Pretty soon, we'll know who that somebody else is. He'll show. He's got to show. Sometime, somewhere, they've got to meet. Their emotions are all kicked up. Whether it's love or hate, it doesn't matter. They can't keep away from each other. They may think it's twice as safe because there are two of them. But it isn't twice as safe. It's ten times twice as dangerous. They've committed a murder. And it's not like taking a trolley ride together where they can get off at different stops. They're stuck with each other and they've got to ride all the way to the end of the line and it's a one-way trip and the last stop is the cemetery."