Jack and Annie travel 500 years back in time to Florence, Italy, and spend a day helping Leonardo da Vinci in the hope of learning another secret of happiness. Jack and Annie are on a mission to save Merlin from his sorrows! The brother-and-sister team travel back in the magic tree house to the period known as the Renaissance. This time, Jack and Annie will need more than a research book and a magic wand. They'll need help from one of the greatest...

Norton and his robot dog like to collect objects that they find on their walks and create new inventions, but one day they find something unlike anything they have ever seen. What is it? What can it do?

"Kellen's life as an outlaw spellsliger is about to get a lot worse. In Gitabria, a miraculous discovery draws spies from all over the continent willing to kill to get their hands on it. Swept up in the race for power, Kellen is forced to join the pursuit. But the invention holds a dark secret--one that could spark a war."--

When these ducks go to the pond, it is Bim, Bam, Bop . . . and Oona, always last. They're all ducks, but Bim, Bam, and Bop are runners, and Oona's a waddler. "Last is a blot on my life," she says to her frog friend, Roy. "I don't feel as big as a duck should feel." But she's good with gizmos, Roy reminds her. So Oona tinkers with things, scraps, and strings, and eventually creates just the right gadget to get her to the pond first. Spunky Oona will...

1666: Two monks at the monastery of Andechs experiment with cutting-edge technology, including a method of deflecting the lightning that has previously set the monastery ablaze. When one of the monks disappears and his lab is destroyed, foul play is suspected. Who better to investigate than the famed hangman Jakob Kuisl?

It is August 1899, and Thomas Edison proclaims his most amazing invention yet: the Spirit Phone Model SP-1. At nearly the same time, a cocksure young mage named Aleister Crowley inexplicably teleports into the home of Edison's archrival, renowned inventor Nikola Tesla. As insanity and suicide multiply among spirit phone users, Crowley and Tesla combine their respective skills in "magick" and technology to investigate the device's actual origin and...