Brothers Jeff and David, along with their cousin Claire, plunge into a dangerous mystery after spotting someone dumping a large bundle into the lake at Cabin Creek in the middle of the night.
While visiting her grandparents in Port Harbor, New Jersey, thirteen-year-old Theodora lists one hundred truths that she discovers while baby-sitting her younger cousins.
Nine-year-old cousins Lily, Rosie, and Tess are sad when it is time to leave Aunt Lucy, so they plan a party and get a special surprise to look forward to in the near future.
When Uncle Tooth invites cousin Olivia along on their trip to Boogle Bay's amusement park, Otto is so upset that he decides to go off on his own and he encounters a ghostly gang of pirates intent on taking over the Fun House.
When he goes to visit his grandparents and his cousin, Lennox, on the island of Tobago, Gregory misses home at first, but as he gets to know both the island ways and his relatives, Gregory begins to enjoy himself.