"No case is too hard for Nickelodeon’s Rusty Rivets! When the key to the city goes missing, everyone assumes Rusty’s Botasaur buried it. But it’s up to Rusty and Ruby to dig up the truth! "-- Provided by publisher.

A little girl enjoys her father's imaginative explanations of his keys, from the one that starts the zippenburger he drives to work to the one that leads to her at the end of the day.

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.

"After defeating the tyrant Malstain, Rachel and Robert are the heroes of Krasnia--but all is not how it should be. Robert is swept away with his new friends, leaving Rachel alone to take care of their ailing father, who's lost without their beloved mother. Rachel has also become the keeper of the hidden bloodred key that opens the way into the Hinterland and is sworn to answer when it calls. So when a young girl, Elsa Spiegel, is illegally smuggled...

"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.

In their second trip through the enchanted library, the new key lands Cleo and Evan in the middle of a spy story, where their impossible mission is to stop a traitor who calls himself Viper--and they find themselves working with the replacement librarian, Ms. Crowley, whose exact role in their adventures is becoming increasingly mysterious.

This time Cleo, Evan, and Ms. Crowley (who, it turns out, is the missing Ms. Hilliard's sister) find themselves in a confusing fantasy book, caught up in a war with wizards, elves, trolls, and the mighty Golden Dragon--and while they manage to find their missing librarian, their quest does not end there.

In their third trip through the enchanted library, Cleo and Evan land in "The Werewolf's Curse" where Evan is promptly bitten by a werewolf, and the two need to find the cure--and the next key--before the full moon rises and Evan becomes stuck in this horror story forever.