"When a strange key opens a door to good fortune and to Opportunity, who will stay with her for seven serendipitous days, Lila soon discovers that the person who lost the key will do anything to get it back"--

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.

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.

"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 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.

Neither Cleo nor Evan like the new school librarian, Ms. Crowley, but they are very curious about where she disappears to at the back of the library, so one day they follow her--and find a secret door, a magical library full of locked books, and a letter from the previous librarian telling them that she is trapped somewhere between the covers of one of the enchanted books, and they must travel through the stories in order to save her.

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.

When Evan and Cleo sneak into the enchanted library at night they find that Locke has already forced his way into a book, and when they follow they find themselves in a plane that promptly crashes into the Amazon rainforest--and with the help of a boy named Gabriel, (and a friendly sloth) they have to survive the jungle and find the golden statue that is the next treasure in their quest before Locke gets his hands on it.

"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...