Who is Grace in the 39 clue book?

Answer 1

Grace is Amy's and Dan's beloved Grandmother who took care of them over the weekends. She dies in the beginning of book 1. She was like no other grandmother, she still had some spunk and was a wild as her grandchildren. In her will, she let a handful of Cahill's deiced if they want a million dollars or one clue.

Answer 2

Grace Cahill is the matriarch of the Cahill family in "The 39 Clues" book series. She is the creator of the Clue hunt and is the grandmother of the main characters, Amy and Dan Cahill. Grace's death sets off the events of the series as her will reveals the existence of the Clue hunt.