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

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 and Brian need help from Nate and Lucy after a hypnotist turns their mother into a duck but does not quite get her changed back.

Bradley, Brian, Nate, and Lucy try to help out the Flying Fortunatos, an acrobatic troupe with a very shabby traveling circus, by identifying the marvelous, hooded trapeze artist they spied rehearsing.

Bradley, Brian, Nate, and Lucy enter their pets in the Fourth of July costume competition, but just as they complete making Polly the pony into Thomas Jefferson, and Pal the dog into the Declaration of Independence, the animals run away and the children must find them before it is too late to win the prize.

KC and Marshall see unauthorized fireworks at the FBI Building and decide to unmask the culprit and his plans for blackmail.

KC and her friend Marshall decide to do a little sleuthing of their own when KC's mom and the clone of the president of the United States are kidnapped by disgruntled astronauts who want to take over the International Space Station.

When Leonard Fisher claims to be the long-lost heir to the Sminthsonian fortune, KC and Marshall set out to prove that he is a phony.

KC tries to uncover the White House spy who is leaking secrets about the upcoming wedding of her mother and the president.

When they discover that one of the thumbs has been broken off the statue in the Lincoln Memorial, KC and Marshall set out to learn what happened and restore the thumb before a ceremony honoring the sculptor.

KC discovers that the President of the United States has been replaced by a clone and sets out with her friend Marshall, on a dangerous mission to set things right.

KC and Marshall take a tour of the Bureau of Engraving and Printing, and when they discover that someone has been stealing bricks of newly printed money, they resolve to find the thief.

Text and photographs portray the appearance and function of eighteen types of hats, including a top hat, jockey's cap, and football helmet.

KC and Marshall throw a Halloween party at the White House, wake up the next day to discover fake, damaging photos of President Thornton on the Internet, and try to help save his election.

Dink, Josh, and Ruth Rose head out to see the sights of Washington, D.