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Amy and Dan Cahill have been located once again, this time in the company of the notoriously unreliable Alistair.

"Mr. Quisling is definitely up to something mysterious, and Emily and James are on high alert.

"Chris Kingsolver has always been especially close to his aunt. He's heartbroken when she dies in a car accident--and shocked to get a coded letter in the mail after her death.

"It was only a few weeks ago that the Biedermann twins, Tess and Theo, along with their friend Jaime Cruz, followed the secrets of the Morningstarrs' cipher further than anyone had in its century-and-a-half history--and destroyed their beloved home in the process.

"It was only a few days ago that Tess Biedermann, Theo Biedermann, and Jaime Cruz, along with a mysterious figure from the past, managed to survive an assault on the locationof the latest clue in the Morningstarr cipher -- and, in theprocess, made a shocking discovery about their own connection to this one-hundred-sixty-year-old enigma.

"Still reeling from the life-changing discovery he found buried in the mysterious archive, Cruz Coronado grapples with an important secret as the gang heads to China in search of the second-to-last piece of the cipher.

"On an island nation in the Indian Ocean, the explorers venture through a vast underwater world and take part in a friendly robotics competition.

"On an island nation in the Indian Ocean, the explorers venture through a vast underwater world and take part in a friendly robotics competition.