The Angvil Branch

{This takes place in 39 Clues Unstoppable 1# but Natalie Kabar is still alive) The Madrigal is not the only ones that are unknown in the family's eyes, there one more branch and it called the Angvil. The Angvil power is knowing the past, Copying skills, strength,knowledge or better at anything, and knows how to make the powerful serum and it's antidote. So you know why pierce wants to them dead or turn them into his personal hitmen or hitwomen for the Cahills but what he didn't know is that the Angvil is close to extinction and the only full-blood Angvil is an 13 year old, platinum blonde, blue eyes girl, who don't know she part of this powerful branch.
Will The Cahill kids and the gang save her from becoming a puppet or fails and Why do Pony knows her?
Meet Marilyn Cross, a hard-working, clever, kid and lower middle class who believes in three types of people, the Black, the White and the Gray. She lives with her happy-go-lucky and alcoholic mother who knows that her child is special.