Henry "Monty" Montague is a British gentleman taking a grand tour of Europe in the eighteenth century alongside his best friend and secret crush, Percy. His father expects him to take over the family estate when he returns--an expectation Monty dreads--so he's determined to make the most of his yearlong trip with Percy, despite the fact that Monty's younger sister is traveling with them. But one misstep leads to an adventure beyond anyone's imagination which includes a manhunt, tomb-raiding, and pirates.