Title: The Mona Lisa key
Description: When Matt, Ruby, and Corey Hudson discover their subway train is actually a time-traveling eighteenth-century frigate captained by a mysterious pirate, they are thrown into a series of adventures that offer cryptic clues about their past and their future.
Subjects: Adventure stories, Juvenile fiction, Brothers and sisters, Time travel, Pirates, Children's fiction, Brothers and sisters, fiction, Time travel, fiction, Pirates, fiction, Adventure and adventurers, fiction