Annie Walker (19). Lead Protagonist. Annie is the younger sister of Ben Walker, but she is wise beyond her years. She often finds that she is the one protecting Ben, instead of the other way around. She's fiercely independent and opinionated, which is unheard of for a young woman during this time. She's incredibly intelligent and quick witted and plays a key role in helping Ben and Reuben and the crew find the treasure her father died searching for.