When her grandfather is involved in a car accident, 11-year-old Isabel embarks on a quest to find a sword that was pledged to her ancestor by the legendary musketeer D’Artagnan centuries earlier. With the help of her 12-year-old nephew Rik and her 13-year-old friend Jules, Isabel must summon the same courage, dedication, and determination as the famed musketeer to recover the missing sword, rescue her grandfather, and bring her family back together.