The students in Miss Mackle's third-grade class enjoy a boat trip on the Connecticut River after a class discussion of ancestors reveals that Sidney and Ida both have connections to the sea.
Harry's interest in solving mysteries has caught the attention of his classmates in 3B, so he challenges them to discover what he has hidden in a giant, old suitcase.
All-star baseball pitcher Orp goes out for basketball in the seventh grade and finds that the skills he has developed in his old sport can be effectively transferred to his new one.
Twelve-year-old Orville and his friend Derrick form their own detective agency and, with help from Orville's younger sister Chloe, investigate the arrival of an unusual letter and the appearance of a mysterious intruder.