We have to deal with a most clever and unscrupulous man, and we must use any means in our power ”otherwise he will slip through our fingers. 
We are dealing with a criminal mastermind, and we must be cautious.
mnli hypothesis: We are dealing with a criminal mastermind, and we must be cautious. premise: We have to deal with a most clever and unscrupulous man, and we must use any means in our power ”otherwise he will slip through our fingers. 