Hallelujah Wonder wants to become one of the first female scientists of the nineteenth century. She knows every specimen and rare artifact that her explorer father hid deep in a cave before he died, and she feels a great responsibility to protect the objects (particularly a mesmerizing and dangerous one called Medicine Head) from a wicked Navy captain who would use it for evil. Now she and her friend Eustace, a runaway slave, must set out on a sweeping adventure by land and by sea to the only place where no one will ever find the cursed relic....

In this captivating quest that spans the globe, a young girl who wants to know everything challenges her assumptions about family, loyalty, and friendship as she fights to save her father's legacy--and to begin creating her own.