two o'clock in the
morning
Vampires are cold , all but the blood . ' '' ` What a fool I am ! ' rejoined Heinrich . ` But you know we have been hearing such horrors lately that a fellow may be excused for shuddering a little when a pale-faced apparition tells him at two o'clock in the morning that he is a vampire , and thirsty , too . ' `` Karl told him the whole story ; and the mental process of regarding it for the sake of telling it , revealed to him pretty clearly some of the treatment of which he had been unconscious at the time . Heinrich was quite sure that his suspicions were correct . And now the question was , what was to be done next ? ''