|“||Not revenge. Justice. And not just for us and our parents, but for the whole world.||”|
— Amy Cahill in Storm Warning
Amy's parents, Hope Cahill and Arthur Trent, perished in the Cahill fire when she was young, and she was placed in the custody of her great-aunt Beatrice with her brother Dan. The children were watched by a long list of au pairs hired by Beatrice, and would frequently visit their grandmother Grace at her mansion. Amy was shy and studious growing up, with her nose almost always in a book. On Christmas 2007, Amy narrowly avoided a kidnapping attempt by the Vespers.
The Clue Hunt
When Amy was fourteen years old, Grace died, and she and Dan were thrust into making a choice: Either walk away with 1 million dollars or take part in the hunt for the 39 Clues. They are told of their great heritage and the role that the Cahill Family has played in history. They collect their first Clue: iron solute, and start off on the hunt for the 39 Clues.
In One False Note, Amy and Dan find another Clue, connected to another one of their famous relatives Wolfgang Amadeus Mozart and distinctly to Nannerl, his sister. They find the Clue tungsten by playing a part of Mozart's music.
The relationship between Amy and Ian Kabra develops greatly in The Sword Thief, Book 3. When Ian and his sister, Natalie, make an alliance with Amy and Dan, Ian develops a crush on Amy while trying to trick her into falling in love with him. However, the relationship ends in disaster when the Kabras betray the Cahills. Despite the betrayal, Ian's interest in Amy is continuous and grows.
Amy and Dan visit Egypt, the grave of the pharaohs, the land of the Sphinx, and the home of their next Clue in Book 4. In this book, Amy and Dan run into more of their relatives and Amy tries to forgive herself for falling for Ian's lies. Alistair Oh becomes their ally again after pretending to be dead. The Clue they find is myrrh.
In Book 5, the Cahill siblings find out that their parents went to Russia, and accidentally went there without Saladin or Nellie. They received help from a Lucian named NRR, a.k.a Nataliya Ruslanova Radova, daughter of Grand Duchess Anastasia Romanov of Russia. Amy and Dan make a temporary alliance with the Holts and ask them to look for the Clue in Siberia. However, after finding the Clue (one gram of melted amber), Eisenhower refuses to continue their alliance.
The Cahill siblings, with Nellie and Saladin, are now on their own again. In In Too Deep, they go to Australia and meet the cousin of their father, Shep Trent. Their time to spend with Shep was short because Isabel Kabra enters the Hunt and is on their track. Because of this, one person (Irina Spasky) sacrifices her life for Amy, Dan, and Alistair Oh and shocked them all. Alistair Oh becomes their ally again.
Next, in Book 7, they go to South Africa and find that there is a Tomas stronghold there. They mistake the Clue for diamond but figures out that it is aloe, later on in the book. They find Grace's plane, The Flying Lemur, and they are still being tailed by Isabel Kabra. Before leaving Indonesia, their ally Alistair Oh is accused and arrested of burning the hut and Irina's death.
In Book 8, Amy and Dan get separated for the very first time because of Dan getting angry at Amy for thinking their parents may have been bad people. Because of this, Amy is now worried of what will happen to her brother. Eventually, they reconcile and go up Mount Everest to get the next Clue, Silk.
During "Storm Warning", Book 9, they finally learn what Madrigals and their true intentions are. They find out Nellie has been sneaking information to William McIntyre but finds out the whole truth in the end. They also find their next Clue, Mace. They are also granted full Madrigal status and Nellie Gomez, their au pair, becomes the very first Madrigal without Cahill blood.
Amy and Dan get a hint that leads them to William Shakespeare in Book 10. Through a series of riddles, their next hint tells them to go to an island off the coast of Ireland, but the other teams track them down. Soon, all the teams are present, including the Starlings. Unfortunately, Isabel Kabra had already reached the center of the Gauntlet and demands all of their Clues. It is said here that Amy was willing to make the ultimate sacrifice for her brother. The teams finally unite and defeat her. Since the teams don't trust themselves around the Clues, they give all of their Clues to Amy and Dan. Because of this, Amy and Dan win the Hunt the way the Madrigals would have wanted them to. They all make it out of the Gauntlet alive, and all the teams come into good terms with each other. They all return to their lives, but it is clear that it all has just begun.
Conflict with the Vespers
It is shown that they returned to their normal lives in The Black Book of Buried Secrets with Dan starting middle school and Amy starting high school. They go to the graveyard to which their parents were buried after they died. There, they find a Clue hidden in Hope's gravestone along with a coded message. It is shown that they went to Grace's bank account in Switzerland, and Amy sends a call to Jonah Wizard that the Vespers are coming.
In Vespers Rising, Amy and Dan went to Switzerland,to see Grace's last will.In the Swizz vault Vespers break in and where they are attacked by Casper Wyoming. Amy received Gideon's Ring and is now the keeper of the ring (predecessor was Grace Cahill). She now wears the ring as part of her new watch.
Amy and Dan's pictures are found behind Casper's painting on the far right, with the coded message: "Keep them alive. For now."
Amy guides you on your mission.
Amy is currently dating Evan Tolliver, and has been for months. She had obsessed over him for the past two years before working up the courage to talk to him. Amy and Dan are forced to steal Caravaggio's "Medusa" or else the Vespers will kill the seven Cahills they took hostage.
In A King's Ransom, Amy and Dan are asked to find and steal the De Virga Mappa Mundi. She is almost killed by Casper and Cheyenne Wyoming in a library.
Amy is forced to steal a stale orb, which turns out to be an astrolabe. The Cahills and the Rosenblooms form a team.
In Shatterproof, Amy and Dan are being set up in the Pergamon museum, and then they fly to Timbuktu and find what the Vespers are looking for. In this book, she kisses Jake, although she feels very guilty about it.
In this book, Amy has lost hope, and she starts to believe that she will not manage. She is forced to give her watch to the Vespers, the last piece to Archimedes Doomsday machine as Vesper One fools her with a footage of Nellie being shot at the temple. She gives up on herself, thinking that everyone she loves has let her done and that she has let down everyone she loves.
Amy comes a few pages into the book apologizing for running away and explaining what she had done with the "serum" Dan was supposed to drink. She discovers Isabel Kabra is Vesper Two, and later she calls a meeting as Jake and Atticus enter the room. She travels by train to the Machina Fini Mundi with Dan, Jake and Atticus, though Isabel Kabra was onboard. She fights with the Vespers where the Machina Fini Mundi was and after witnessing the death of Dave and Isabel, is barely alive for seven days when a huge chunk of rock hits her head.
Search for the Antidote
Amy, Dan, Ian, and Jake are traveling on Jonah's private jet to see Dr. Rosenbloom.
Amy, Dan, Atticus, and Jake are in Tikal trying to find the riven crystal for the antidote. While trying to save Dan, she drinks the flask of the Master Serum Sammy Mourad gave her. As a result, she suffers various side effects like perceiving Jake as a jaguar and twitching of muscles. She will die in one week unless saved by the antidote.
Fighting the Outcast
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- Arthur Trent: Father (deceased)
- Hope Cahill: Mother (deceased)
- Dan Cahill: Brother
- Beatrice Cahill: Great-aunt (former legal guardian)
- Fiske Cahill: Great-uncle (legal guardian)
- James Cahill: Great-grandfather (deceased)
- Edith Green-Cahill: Great-grandmother (deceased)
- Flora Cahill St. James: Great-great-grandmother (deceased).
- Henry Cahill: Great-great-grandfather (deceased)
- Madeleine Cahill: Great x22 grandmother (deceased)
- Jane Cahill: Great x22 grand-aunt (deceased)
- Thomas Cahill: Great x22 grand-uncle (deceased)
- Luke Cahill: Great x22 grand-uncle (deceased)
- Katherine Cahill: Great x22 grand-aunt (deceased)
- Gideon Cahill: Great x23 grandfather (deceased)
- Olivia Cahill: Great x23 grandmother (deceased)
- Nellie Gomez: Legal guardian, former au pair
- Madeleine the Matriarch: Great x26 Grandmother (deceased)
- Shep Trent: First cousin, once removed
- Evan Tolliver: Former boyfriend (deceased)
- Jake Rosenbloom: Boyfriend
- Sinead Starling: Former best friend, former Vesper.
- Isabel Kabra: Enemy (deceased)
Amy is described as a stuttering, shy bookworm. In the first few books, her stuttering and shyness didn't let her say a word. Because of that, she was often mocked by her relatives and competitors in the Clue Hunt. But as the series progressed, she gradually lost her stuttering and became less shy. Although she usually displays her deep annoyance with Dan (often calling him a dweeb), deep inside, she cares very much for him and does not want to lose him, especially after losing her parents and her grandmother.
Amy is a genius intellectual and is very clever. She is an extremely good researcher, something that it is shown many times during the series. In the "Maze of Bones", it was stated that she dreamt of going to Harvard and study archaeology and history like her mom.
Amy is medium-height and was six inches taller than her brother in 2008. She has long, reddish-brown hair and jade-green eyes that she shares with her brother Dan.
She is said to be often seen wearing jeans and an old T-shirt because she didn't want to attract attention. She used to wear Gideon's ring in a specially made watch but had to give the ring to Dan so they could get the hostages. When she did this she stuck out her left arm which would mean she is right handed if she is wearing a watch on her left arm.
- Possesses common sense. (THIS IS VERY IMPORTIANT)
- Thanks to reading a lot, figures out many things no one else would have.
- Knows a lot about historic events and people, also due to reading.
- She can overcome fears after a while.
- Remembers most of what Grace had taught her.
- Has a deep knowledge of martial arts in Series Two.
- Not being afraid of heights although she was nervous being airlifted.
- In Unstoppable Mission 1: Written In Stone on the profiles it states she is good at ice skating and baking.
- One The Ringleader card it says that she can kickbox and rock climb.
- Amy has a CliqueMe page on the Cahill Web.
- She also guides you on Cahills vs. Vespers Mission 0: The Acropolis Raid.
Amy's main card is Card 18: Amy Cahill. She also has many more cards.