List of The 39 Clues characters
Amy and Dan Cahill (both from Boston,who are kids that took up the quest). Nellie Gomez (Also from Massachusetts) serves as their au pair and supervisor. They are the protagonists of the franchise. Amy is fourteen years old while Dan is eleven. Both of them have jade eyes. Amy is shown to be intelligent and analytical, while Dan is more active, with a photographic memory. Amy, however, is agoraphobic and pyrophobic,; while Dan has asthma and is claustrophobic. They were both wards of Beatrice Cahill since the death of their parents Hope Cahill and Arthur Trent. Throughout the hunt, Amy, and Dan provided the least power to search for the Clues. Surprisingly, they have collected as many Clues as everyone in the hunt, with the help of Nellie Gomez . In the end, Amy and Dan reunite the Cahill family altogether, bringing peace to every Cahill who worked almost 500 years for finding the 39 Clues. Following the events of Into The Gauntlet, and after making peace with Ian and Natalie Kabra, Hamilton Holt, Alistair Oh, Sinead Starling and Jonah Wizard, Amy is named their grandmother Grace's successor and head of the family. They are now in custody of Nellie Gomez and Fiske Cahill. Their branch is revealed late in the series to be Madrigals; the secret fifth branch descended from Madeleine Cahill. Amy's official card is No. 18 while Dan's is No. 2.
Kyle Craig
Kyle first appears as an FBI agent in "Along Came a Spider" continuing to "Violets Are Blue" He becomes a friend of Alex Cross, the series protagonist, helping him out on his cases to capture killers, even using his FBI connections to give him resources. By the novel "Roses Are Red", a new serial killer called the "Mastermind" is causing trouble with a series of bank robberies and murders, one of which involves the killer murdering Alex's girlfriend and partner, FBI agent Betsey Cavalierre. By the end of the novel, it is revealed that Kyle Craig himself is the serial killer, but no one knows the truth. In "Violets Are Blue", Craig, as the Mastermind, continues to taunt Alex and later reveals himself at the end of the novel. When he tries to kill Alex, he is defeated and arrested by Alex himself. During his interrogation, Craig reveals that he killed multiple times before during the book series and that he killed Betsy because she was onto him and that her love for Alex was growing stronger and coming between him and Alex. After his trial, Craig is sent to prison. From books "Four Blind Mice" to "Double Cross", Craig is held at the supermax prison, ADX Florence. He is visited by Cross only when he has available information on certain cases. It's also revealed in Cross Fire he has ASPD(Antisocial Personality-Disorder) and boasts an IQ of 149