Young runaway whom Penny asked Henry to help. Initially mistrustful, she forms a tentative friendship with Henry while pursuing her goal of finding her father, who was lost at sea. She witnesses Penny's accident and helps Henry heal from his grief. Together they build a raft and sail across the Atlantic.
Penny knew Millie beforehand and entrusted her care to Henry before her death.
Henry takes on a protective and guiding role for Millie after meeting her.
Explore the full interactive character relationship map of The Book of Love