Dick

But Dick became convinced that Perry was that rarity, 'a natural killer'--absolutely sane, but conscienceless, and capable of dealing, with or without motive, the coldest-blooded deathblows. It was Dick's theory that such a gift could, under his supervision, be profitably exploited. Having reached this conclusion, he had proceeded to woo Perry, flatter him--pretend, for example that he believed all the buried treasure stuff and shared his beachcomber yearnings and seaport longing, none of which appealed to Dick, who wanted 'a regular life,' with a business of his own, a house, a horse to ride, a new car, and plenty of blond chicken.' It was important, however, that Perry not suspect this... (Capote 55)

After realizing Dick's point of view, it is very apparent how much the 'team' uses the opposites dreams. Perry believes in "all the buried treasure stuff...none of which appealed to Dick." Dick wants "a regular life", the complete opposite of Perry who has a "seaport longing". The last sentence really says it all. Dick is obviously using Perry and cannot let him "suspect this".

Perry is so convinced of Dick's loyalty. Dick can expertly "woo Perry, flatter him--pretend". All of these manipulators will eventually put a strain on the friendship. Dick plans to "profitably [exploit]" Perry for his "conscienceless." If Perry isn't this "natural killer", the base of their friendship will fall apart. Each friend needs something. If this need isn't filled, all plans will fall apart. This paragraph shows how their friendship hinges on such a thin thread. What if Dick is wrong about Perry?

Dick's plan for "the coldest-blooded deathblows" is the first concrete passage mentioning murder. It has been hinted at, but not said. Now that we know they are the killers, anticipation is building. I am set on their false friendship being the end of them.