As a Father's Day gift to the twins' Dad, Bradley, Brian, and their cousins Lucy and Nate try to identify and stop whatever creature is biting fruits and vegetables in the garden.
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.
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.
Bradley, Brian, Nate, and Lucy visit a haunted hotel on Halloween, but once inside they realize that they have seen plenty of people going in and none coming back out.
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.
