After her grandad is injured in a car accident, headstrong Isabel and her family join other relatives at the historical family home in Holland. The grandfather starts the teens searching for the legendary sword of the famous D'Artagnan, which for centuries had disappeared. A couple of sickbed clues and the scrap of a map sets the journey in motion. Things begin to add up, but the kids soon discover they are not the only ones who want the sword. Written by Kim Reeves