Roy, Ron

Dink, Josh, and Ruth Rose are enjoying Halloween fun in Sleepy Hollow, New York, but when unplanned spooky things start happening, they investigate whether a real headless horseman might be to blame.

KC discovers that the President of the United States has been replaced by a clone and sets out with her friend Marshall on a dangerous mission to set things right.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 investigate the theft of a priceless Tiger's Eye that was loaned to the National Zoo from China.

When KC and Marshall see lights flickering at night in the Washington Monument, their investigation turns up a monkey, a hole in one of the monument stones, and a hundred-year-old mystery.

Someone has been stealing and leaving behind little green sneakers, so Bradley, Brian, Nate, and Lucy trail their new teacher, who wears the same shoes in normal size.

Dink, Josh, and Ruth Rose head out to see the sights of Washington, D.C. in the snow in December, and meet KC, the president's stepdaughter, and her friend Marshall, and when the president's dog goes missing, the kids head into the dusk to search as the snowstorm increases.

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.

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 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.

KC discovers that the President of the United States has been replaced by a clone and sets out with her friend Marshall, on a dangerous mission to set things right.