The Alden family are off on another adventure, this time on a Hawaiian vacation in The Black Pearl Mystery. The Alden's are so excited to go visit Grandfather's cousin Mary and help her on her pineapple farm. When the kids hear about the legend of the black pearl, they want to know more about it, but nobody seems to be able to shed any light on it! Can the Boxcar Children discover the secret and help their cousin? #64 in the series.
While helping their grandfather's cousin on her pineapple plantation in Hawaii, the Alden children discover some strange happenings on the island--the least of which is the mystery behind an enigmatic black pearl.