In 1264, Jean of Toulouse, a young French student and friar accused of heresy by the Inquisition, is sent to Oxford to spy on the scholarly monk, Roger Bacon, who is suspected of being a heretic for his advanced scientific ideas.
After his best friend is shot and killed, fourteen-year-old Langston borrows his science teacher's time machine and travels from Los Angeles in 2010 to Oxford, England, in 1278 to try to prevent Roger Bacon from publishing his formula for gunpowder.
