The hardest vow to break is the one made in blood. Eurydice Beauregard is the fiercest swordswoman in the kingdom, trained by her father with one deadly mission: assassinate Prince Theron. Entering the palace under the guise of a loyal Royal Musketeer, Eurydice finds herself surrounded by palace intrigue and two fiercely loyal friends. When the young Prince Theron's life is endangered, Eurydice breaks her sacred oath to her father, choosing friendship and honor over family duty. Now, with her father's assassins closing in, Eurydice and her allies must risk everything to save the Prince and expose the ultimate betrayal. This daring trio will prove that the power of true friendship is stronger than any broken vow.