from previous--

david"s  daughter  carol  was  murdered  on a  remote  small island  , he  takes  his  athletic  friend  karlton along  with him on a  twenty  feet  long  boat  , finding the  island  was  not  difficult  becasue  of  a  hollywoodian style  huge  picturesque  mansion on the  beach  towering  high  amidst  a  green lawn spread  out  to  the  shore with three   boathouses  , with  separate  boats  to  enter  the  lake