A mysterious stranger appears at a New Year"s Eve party, becoming the enigmatic sleuthing sidekick to the snobbish Mr Satterthwaite! So far, it had been a typical New Year"s Eve house party. But Mr Satterthwaite -- a keen observer of human nature -- sensed that the real drama of the evening was yet to unfold. So it proved when a mysterious stranger arrived after midnight. Who was this Mr Quin? And why did his presence have such a pronounced effect on Eleanor Portal, the woman with the dyed-black hair?