Young Anna Holloway's father was murdered in the streets of Boston, and she must leave with her family to join her uncle, John, in the New Mexico territory. But when she discovers a hidden map to a buried treasure, she learns that uncle might not be the benefactor that her family believes he is. Her suspicions are confirmed when a stranger appears in search of the map and takes Anna's brother, William, hostage. Now she must find him and run with the map to keep him away from her family, or he will kill them all to find the treasure for himself.