During his trip to England, Mac seems to be stalked by person or persons unknown; he starts receiving anonymous phone calls (most of which are silent, though some are very short messages from an unidentified caller) from a phone extension of 333 at 3:33 am; the calls continue after he gets back to New York. It appears that whoever is stalking Mac seems to know him intimately, as the calls keep coming despite him transferring to another hotel and changing his cell phone number.