Daniel Cook, and his sister, Beatrice, are thrilled to be studying dragonology with Dr. Ernest Drake. They're even awaiting the hatching of a dragon's egg in their care! But all is not well as there are rumors of a deadly plague affecting dragons around the world. Could dark dragonologist Alexandra Gorynytchka be behind the mysterious illness? The secret to curing the dragons might be in the Liber Draconis, a diary written by a wise dragon ages ago....

"Ooh la la! Nikki Maxwell and her band are on their way to Paris, but they run into some roadblocks on the way--and Nikki's French skills may not be as reliable as she hoped! Can she get them moving again in time to reach their destination?"

Bub the pug has never seen snow before, and when Duchess the cat tells him it is frozen rain he is appalled and does not want to go out even to play with his human, Bella -- but the week is about to get worse because a new family has moved in next door, and they apparently have a pet monster (at least if Nutz the squirrel can be believed) and Bella's mother has arranged a play date for Sunday.

On summer vacation in Scotland, the Thea sisters are intrigued by a tapestry that is really a treasure map supposedly leading to a hidden alabaster garden where an ancient treasure is buried, and the story of Aurora Beatrix Lane, an adventurous explorer mouse--and when the tapestry is stolen they set out to find the treasure using the explorer's diary as a guide.

The Thea sisters continue the search for the seven ancient treasures, using the clues found in Aurora Beatrix Lane's travel diary to find a fabulous emerald which once belonged to Cleopatra--a quest that leads them from Moscow, to the Sahara, and finally Bolivia.