Almost from the moment of first publication in book form In Cold Blood - soon to be a best-seller and Book-of-the-Month Club selection - is surrounded by controversy. Has the author, by not doing enough to prevent the two culprits` executions, compounded the ruthless and chilling murders depicted in his book?  After all, without them and their co-operation, there would be no book. In spite of Capote`s furious protests and in spite of such notable defenders of his cause as the notable cultural commentator, Diane Trilling, the phrase `in cold blood` begins to take on additional significance.