Seven-year-old Tessa and ten-year-old Cameron daughters of the first female president, and owners of a very rambunctious dog, play detective when a baton belonging to the director of the Marine Band goes missing at the White House.
Now in fifth grade, Drake Doyle and Nell Fossey continue to combine their detective and scientific investigation skills to solve a variety of cases, involving a noisy laundry chute, a ruined flower show, and a ghost.
Fourth-graders Drake Doyle and Nell Fossey combine their detective and scientific investigation skills to solve a variety of cases, involving a noisy garbage can, endangered frogs, a stuck truck, and a mysterious love letter.
Fifth graders Drake Doyle and Nell Fossey use their detective and scientific investigation skills to solve cases which involve food poisoning, missing terns, a haunted treehouse, and a pig in a pit.
Xena and Xander Holmes, an American brother and sister living in London, use clues from their ancestor Sherlock Holmes' casebook to help classmate Alice Banders, who goes missing following the announcement that she will be crowned queen of Borogovia after her thirteenth birthday.
Saxby Smart, schoolboy private detective, invites the reader to follow the clues as he investigates three cases involving hidden treasure, a string of break-ins where nothing is stolen, and a rare comic book taken from an undamaged safe.
Tom and Jamie discover a prehistoric paradise and decide to explore a cave where they can swim with ichthyosaurs--dolphin-like dinosaurs--but a hungry plesiosaur adds a deadly element to their snorkeling adventure.
