DISCLAIMER: There is another general Fan Theories post coming. It’s just that The 39 Clues has a lot of mystery to it, so I’m giving 39 Clues a post to itself.
Madrigals: Who was, who wasn’t?
If you have read the entire first series of the 39 Clues, you understand that the Madrigals are a secret branch and they watch Cahills, and if they want to recruit a Cahill, they will give them a final test, and if they pass said final test, they would be told the history of the Madrigals, and become a Madrigal. It is not mentioned who could have been a Madrigal in the first place or during the series itself. I am going to examine each main character and historical figure of the first series in a Madrigal point of view, who weren’t already Madrigals.
The Clue Hunt itself was a final test for everyone who took the hunt and after the clues were found, all participants would become Madrigals, because after the first series, the younger generation (plus one) became Madrigals. Perhaps when the Madrigals felt that the clue hunter was ready they made them Madrigal.
At the end of “The Black Circle”, Irina tries to protect Amy & Dan and get them out of the Circle before Lucian guards came, but they did, but so did the Man in Black (Fiske Cahill, the head of the Madrigals) came to fight the Lucians. But he release Irina anyways. Why would he release Irina? The Madrigals had chosen the possible competitors, hoping to turn so of them into Madrigals (along with stopping the Vespers to find the clues as well), one of them Irina. There was about two or three days between the end of “The Black Circle” and “In Too Deep”, the Madrigals must have noticed that she began to change in “Beyond the Grave” when she doesn’t destroy the tomb with Amy & Dan in the tomb. So, they test her, between “Beyond the Grave” and “The Black Circle”, which was about a couple of days in between.
In between “The Black Circle” & “The Viper’s Nest”, Jonah Wizard was never in the story at all, and his heart is out of the hunt by the end of “The Emporer’s Code” because how much he values human life. Maybe, at some point, he became a Madrigal, and realized the hunt was too much for him. A counter-arguement to that is when Dan reveals that he is a Madrigal, he is left shocked. HE’S AN ACTOR! He can fake faces, and lie to his parents, who are way more into the hunt than Jonah. In “Storm Warning”, he is once again invisible. But in “Into The Gauntlet”, he’s really to work with anybody (other than the Kabras). The Madrigals are all about working together in between branches. Perhaps Jonah thought of a new way to get the clues, but he needed other people, like Dan Cahill, the person he knows the best, but also fellow Madrigal.
Hamilton was always the Holt who cared. But in “The Black Circle”, Hamilton aligns with Amy & Dan but his dad is very uneasy about the alliance. Even after the alliance is broken by his father, he is helping them behind his dad’s back. He’s always ready to work with Amy or Dan. But they are the only ones he is willing to help. I honestly think Hamilton was hunting clues with his heart, he wasn’t a Madrigal until after the Hunt.
Off the bat, Alistair is making alliances left and right. None with anyone in his branch. But he was watching Grace for a long time. Why would Madrigals spy on each other? Then he has an alliance with Amy & Dan and the Kabras, in which the Kabras flip. He aligns with Amy & Dan again the next book, and again two books later. He is then arrested by his uncle, who thinks he’s lazy and going about the clue hunt the wrong way, but there could be more to it. Finally in “Into The Gauntlet” Alistair realizes that there was a love of human life that he never saw (Showing he was never a Madrigal until after the Gauntlet).
In “Maze of Bones” they get blown up and put in hospital and don’t appear until “Into the Gauntlet”. So no.
Grace was poisoned
Reading the 39 Clues again, Grace was dangerously close to finding all 39 Clues… and then she gotten cancer. It’s possible that she was poisoned by either a rival Cahill or a Vesper. It wasn’t Alistair. In “Maze of Bones”, he wanted to watch her for longer than he got to. Grace had many enemies in the Cahill family. They didn’t know that Grace would pull her other will, which triggers the clue hunt, meaning that the biggest threat in the Cahill family was taken out, meaning that someone else was super close to finding every clue, has an easier road to the clues.
Isabel & Vikram Kabra (Ian & Natalie’s parents) hatched the plan to take out her daugther, so would they take out her mother, who is much closer than they were to the clues? Also, in “Rapid Fire 2: Ignition”, Ian and Natalie already figured out that the post-funeral would be a huge clue hunt. Bae Oh was dangerously close and didn’t want his nephew to get the clues and he must have figured out that his nephew adored Grace, Cora Wizard may or may not have done something. Maybe Irina Spasky, who at the time was bitter had poisoned Grace. The Outcast may or may not be bitter about what happened between him and Grace and took out Grace. An unknown fact is that there was a Madrigal who was actually a Vesper had tried to infilrate the Madrigals other than Sinead Starling. She was in the cards. Her was Ana Kosara. She may have wanted the clues and poisons Grace and tries to steal her clues. The Vespers could have done it because he knew that the clues were almost found and Grace’s death would likely cause even more chaos in the Cahill family, letting the Vespers hunt clues without Cahills finding them. Also in “Rapid Fire 2: Ignition”, a Vesper poses as Cousin Ingird, a Cahill who turns down the hunt. Also, in “Rapid Fire: Legacy”, Amy & Dan were attacked by Vespers eight months before Grace dies, meaning that within 8 months the three most potentially powerful Cahills would all be gone. AND, Vesper One poisoned Astrid Rosenbloom, a Guardian.
The Rosenblooms (and possibly other Guardians) are actually Cahills
Astrid Rosenbloom was an incredibly smart woman, and so was Atticus, who had a good idea about what was going on with the Cahills. Jane Sperling was a Guardian and an incredibly sneaky lady. Guardians protect the doomsday device from ever being used. There’s a good chance that some generation had a child with a Cahill (possibly early in the Cahill timeline). So, maybe the Guardians are Cahills as well.
J. Rutherford Pierce may have been a Vesper or was aligned with the Outcast
After Cahills vs. Vespers, Pierce who was disgusing Fiske Cahill had taken the serum. The only people in the world who had known about the clues were the Cahills and Vespers. There is a solid chance that Pierce was an Ekat or a Vesper agent and was a new part of the Council of Six.