"When Nancy finds an old desk at a tag sale, she soon finds out that someone left behind a key. Nancy and Bree set out to unlock the secret of the silver key in the hopes of finding some treasure along the way."-- Page [4] of cover.

Diego is under the spell of the wizard Maldred who wants to control the Naga, an enormous dragon that lives deep within the Earth, and plans to use Diego to steal the two keys necessary for that purpose; the first key is guarded by Argent, the silver dragon, and Jean his dragon master, so Drake, Bo, Carlos, and their dragons travel to Gallia to try and stop the theft and break the spell on Diego.

The last thing Jack expected when he bungee-jumped at the fairground was to plummet into a maze of underground rooms, full of traps, puzzles and some weird and wonderful people. Alongside a mysterious girl called Cally, he must find the keys to unlock each room and find his way home: facing hundreds of tiny yet ferocious lions, a revolting game of Would You Rather and some mind-blowing riddles on the way.

The evil wizard Maldred has stolen the gold and silver keys which will allow him to release the Naga, the powerful earthquake dragon at the center of the earth--so Drake and several of the other Dragon Masters travel to the Naga's Temple in the Dragon Islands, to try and stop Maldred, and prevent him and the earthquake dragon from destroying the kingdom.

"Tash doesn't want to go to camp, doesn't want to spend the summer with a bunch of strangers, doesn't want to be separated from the only two people she has ever been able to count on: her uncle Kevin, who saved her from foster care, and Cap'n Jackie, who lives next door. Camp turns out to be pretty fun, actually, but when Tash returns home, Cap'n Jackie is gone. And Tash needs her -- the made-up stories of dolphin-dragons, the warm cookies that make...

A constant worrier, Franklin Endicott earns a fresh cause for alarm when he accompanies Eugenia Lincoln to her favorite thrift shop and leaves with a mystery to solve.

Since speaking to Siloé, Nola has learned a lot about her own mother and the history of Pandorient, but there are still questions and when Nola finds a strange key she returns to the other world to find out what the key will open--but nobody knows what might happen if this particular door is unlocked.