


Amy decides that Grace wants them to join and Dan agrees. Their relatives, the Holts, the Starlings,the Kabras, Jonah Wizard and his father, Irina Spasky, and Alistair Oh join. During the reading, a video of Grace plays and she informs everyone that they have a choice to go home with a million dollars, or get a clue and join the hunt to become the most powerful person in the world. Amy and Dan are invited because they were really close to their late grandmother that they even stay in her huge mansion during the weekends. William McIntyre announces that only a selected number of relatives are invited to the reading of the will. The Cahill family is so big that they have distant relatives in almost all countries. At the funeral, both of them are bullied by their distant relatives. Aunt Beatrice who serves as the guardian for both Dan and Amy drives them to the funeral. She dies after telling him that he needs to execute the other will that she wrote. The story starts with Grace Cahill talking to William McIntyre about changes in her will. The story follows the adventures of Amy Cahill, 14 years old and Dan Cahill, 11 years old, both grandchildren of Grace Cahill.

Amy and Dan Cahill goes around the world to discover their family's secrets and the possibility of becoming the most powerful human by winning their family's race to the 39 Clues.
