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Skilled code-cracker and detective Ruby Redfort has an adventure at sea in which she must crack the case of the Twinford pirates while avoiding a vile sea monster and the evil Count von Viscount.

When a mysterious letter written in code arrives at King's house for his human, Kayla, he follows the trail of the person who left it.

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

Twelve-year-old Addison Cook and his friends are on the hunt for a long-lost treasure.

The members of the Code Busters Club take a class trip to Angel Island, the Ellis Island of the West, where they discover a mysterious box with a connection to one of the Code Busters.

Logan tells Quinn that he likes breaking codes so she gives him a coded message.

On the morning of June 12, 1962, guards at Alcatraz Prison discovered that inmates Frank Lee Morris, John William Anglin, and Clarence Anglin were missing from their cells.

Thirteen-year-old Ruby, a code-cracker and detective, gets an anonymous call that leads her to the headquarters of Spectrum, a highly secret anti-crime agency that needs her help to crack a code, but she uncovers an evil plan by the Fool's Gold Gang.

When twelve-year-old painter Esther gets stuck at math camp rather than art camp, she is determined to prove herself but someone leaves cryptic messages intended to drive her away.