A Clue found in Book 3 sends Amy and Dan jetting off to find out just what's behind the fierce rivalry between the Tomas and Ekaterina branches of the Cahill family. Was a Clue stolen from the Tomas branch? Where is it now? And most important, can Amy and Dan get their hands on it before their rivals do?

"A strange telegram lures fourteen-year-old Amy Cahill and her younger brother, Dan, deep into Russia and away from the only trustworthy adult they know. Signed with the initials NRR, the telegram launches a race to uncover a treasure stolen by the Nazis and the truth behind the murder of the last Russian royal family. All too soon, the treasure hunt starts to smell like a Lucian trap. But the bait might just be irresistible--what will Amy and Dan...

"Just after twelve-year-old Emily and her family move to San Francisco, she teams up with new friend James to follow clues in an odd book they find, hoping to figure out its secrets before the men who attacked Emily's hero, publisher Garrison Griswold, solve the mystery or come after the friends." -- Provided by publisher.

Everybody starts somewhere, and once upon a time Luigi Lemoncello was a twelve-year-old boy in a large family who dreamed of being a showman. He gets his first chance working for a famous barker at a summer carnival, where a mysterious puzzle leads him and his friends on a treasure hunt.

Sixteen-year-old Lily left a red notebook full of challenges on her favorite bookstore shelf, waiting for just the right guy to come along and accept its dares. Dash, in a bad mood during the holidays, happens to be the first guy to find the notebook and rise to its challenges. What follows is a whirlwind romance as the two trade dares, dreams, and desires in the notebook they pass back and forth at locations across New York City. But can their in-person...

"Could the Mark Twain books hidden through Book Scavenger contain clues about the string of recent arson fires plaguing the city? And will Emily and James uncover the mystery before the arsonist comes after them?" -- Provided by publisher.

Eleven-year-old Millie and five other girls, snowed in at Amelia Earhart Birthplace Museum in Atchison, Kansas, are on a scavenger hunt when the lights go out and Amelia's aviator goggles go missing.

During a weekend trip to Ocracoke Island, siblings Judy and Stink Moody take part in a pirate treasure-hunting game, in which various clues lead them to silver coins, or "pieces of eight," hidden across the island.

After her parents treat Tilly to a treasure hunt, they all play hide-and-seek.

"After passing an intense exam, Edwin Edgefield becomes one of the lucky few to attend an exclusive weekend at the mysterious high-tech institute of the uber-famous-ultrabazillionaire-genius-recluse Onasander Octagon. Edwin hopes he'll meet other kids like him--kids who will accept him even though he's got a photographic memory, genius-level math skills, and some very specific personality quirks. But when he meets the other misfits (um, students),...