Actually, the last thing the Andrews children are looking for is another adventure, but they find themselves smack in the middle of one when they sneak aboard a yacht to investigate some suspicious circumstances. Why are these strangers so anxious to make contact with the tribe Brandon and Jeff and their family met last summer? No one believes for a minute that their motives are charitable — particularly when one of the boat's principal passengers turns out to be the children's old nemesis, Dr. Anthony! Can the kids save their friends from his evil purposes? And will they ever get home again? This exciting story will keep the whole family on the edge of their seats!