four in the morning
`` He 's familiar with hypodermic syringes , '' I repeated . `` Which does n't prove that no one else would use one . '' `` Anyhow , he was out until four A.M. last night and some one broke into Phelps 's house to -- '' `` You ca n't establish the fact that he went out there . There are plenty of other places he could have been until four in the morning . '' `` But I can assume -- '' `` If you are going to assume anything , Walter , why not assume he was the second man , the man who watched the actual intruder ? '' I turned away , despairing of my ability to convince Kennedy . As a matter of fact I had forgotten the other prowler at Tarrytown .