Through the course of a difficult season, Ronde learns that his coach is right about football being a mental game, as he tries to fill in as kicker while he and his identical twin, Tiki, help Adam improve his grades.
Twins Stephanie and Zeke, their friend Hector, and cats Fitz and Meathead once again venture into the world of Underwhere, this time looking for the missing Brush of Wisdom, a magical item that looks suspiciously like a jeweled toilet brush.
A lonely boy named Radish Rademacher hopes to become a member of his twin sister's detective agency after showing the members an old treasure map he found in a cave.
When three leprechaun statues disappear just before St. Patrick's Day, Bradley, Brian, Nate, Lucy, and other friends follow clues in order to prove that Lucky O'Leary is innocent of the crime.
Seven-year-olds Bradley, Brian, Nate, and Lucy make observations and gather clues that convince them that their older siblings, cousin, and animals have been captured by hungry space aliens.
Bradley, Brian, Nate, and Lucy follow clues to find whoever left a rabbit in their first-grade classroom on Valentine's Day, because they are worried the rabbit will get sick and die of loneliness.
Eleven-year-old Miri Gill feels left out in her family, which has two sets of twins and her, until she travels back in time to 1935 and discovers Molly, her own lost twin, and brings her back to the present day.
