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.

Bradley, Brian, Nate, and Lucy follow clues on an Easter treasure hunt, while trying to figure out who set it up for them.

While visiting Houston, Texas, Mike and Kate tour the Johnson Space Center with an astronaut in the morning and at the Houston Astros' ball game that evening, the cousins search for the person who steals the astronaut's moonrock when he arrives at the stadium to sign autographs.

Cousins Kate and Mike visit Kate's father, a baseball scout for the Dodgers, in Los Angeles just as a series of suspicious events lead him to think that someone is trying to steal his scouting reports.

In 1935, when her mother gets a job housekeeping for a woman who does not like children, eleven-year-old Turtle is sent to stay with relatives she has never met in far away Key West, Florida.

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.

Shortly before her thirteenth birthday, shy and withdrawn Tara is sent to stay with her aunt, uncle, and cousin in her parents' hometown of Willow Falls, where she makes friends and becomes involved with an elderly buyer and seller of collectibles, who seems to be trying to give Tara some kind of mysterious message.

After a family emergency sends twelve-year-old Will and five-year-old Jamie to Scotland, a "magic eye" book takes them and their cousin Nan on a journey through their family's violent history.

When Momo the flying squirrel arrives for a much-anticipated visit with his cousins, they think Momo is no fun until they try doing things his way.

Tyler writes a letter home each of the twelve days he spends exploring Iowa at Christmastime, as his cousin Olivia shows him everything from a goldfinch in an oak tree to twelve "mutton busters." Includes facts about Iowa.